(in alphabetical order)






























































































































































Oberna                                                                                     Caryophyllaceae

     Oberna behen = Silene vulgaris

     O. multifida                           Macrosiphum stellariae

     O. wallichiana                        Aphidura ornatella; Aphis craccivora

Use key to apterae on Silene.


Obione see Atriplex                                                              Amaranthaceae


Ochetophila                                                          Rhamnaceae

     Ochetophila trinervis                Aphis conflicta


Ochna                                                                      Ochnaceae

A single aphid species, Sitobion ochnearum, is recorded from 4 spp. of Ochna; O. afzelii, O. leptoclada, O.  pretoriensis, O. pulchra.                                       


Ochradenus                                                 Resedaceae

      Ochradenus baccatus                   Myzus persicae


Ochroma                                                                 Bombacaceae

      Ochroma lagopus                         Aphis gossypii


Ochthodium                                                 Brassicaceae

      Ochthodium aegyptiacum            Brevicoryne brassicae


Ocimum                                             Lamiaceae

      Ocimum americanum                  Aphis gossypii

      O. basilicum                                  Aphis [affinis], craccivora, fabae, gossypii;

                                                              Aulacorthum solani; Macrosiphum mesosphaeri;

                                                              Myzus ornatus, persicae; [Ovatus crataegarius];

       `                                                     Sitobion colei

       O. canum = O. americanum

       O. gratissimum                              Aphis gossypii; Aulacorthum solani;

                                                              Macrosiphum mesosphaeri, salviae; Myzus ornatus

       O. minimum                                  Myzus ornatus

       O. obovatum                                  Aphis gossypii

       O. sanctum = O. tenuiflorum

       O. tenuiflorum                              Aphis gossypii; Macrosiphum mesosphaeri; Myzus ornatus

       O. urticifolium = O. gratissimum

       Ocimum sp.                                   Aphis spiraecola; [Sitobion indicum]

Key to apterae on Ocimum:-

1     SIPH mainly or wholly dark, with a subapical zone of reticulation (at least 4-5 rows of closed polygonal cells)                                                                                                     …..2

-      SIPH pale or dark, without subapical polygonal reticulation

…..go to key to polyphagous aphids

2     ANT and tibiae mainly pale.  Dorsum with an extensive solid dark shield across ABD TERG 1-5, fused with marginal and antesiphuncular sclerites. Longest hairs on ANT III less than 0.5 Χ BD III                                                                                                         …..Sitobion colei

-      ANT and tibiae mainly dark. Dorsum without a complete dark shield, with or without a less extensive dark patch. Longest hairs on ANT III more than 0.5 Χ BD III                        …..3

3     Dorsal abdomen with a central dark patch. Head as dark as ANT. SIPH wholly dark. Process at base of prothoracic furca is tubercular, about as long as its basal width

…..Macrosiphum salviae

-      Dorsal abdomen without a dark central patch. Head paler than ANT. SIPH usually with paler basal section. Process at base of prothoracic furca is broadly conical, much shorter than its basal width                                                                               …..Macrosiphum mesosphaeri


Ocotea                                                                                      Lauraceae

       Ocotea acutifolia                           Lizerius ocoteae

       O. glomerata (?)                            Lizerius pustulatus

       O. porphyria                                  Lizerius ocoteae

       Ocotea sp.                                      Aphis (Toxoptera) aurantii; Lizerius tuberculatus  

Key to species:-

1     Body of aptera with conical, club-shaped or crown-shaped processes                              .....2

-      Body of aptera without processes                                    .....go to key to polyphagous aphids

2     ABD TERG 1-5 each with 6 sclerites, the marginal ones developed into short conical processes, and transverse bars on ABD TERG 6-8; ABD TERG 8 bearing 2 large conical processes and 2-4 much smaller ones (fig. 63A). Antenna of aptera 6-segmented

.....Lizerius ocoteae 

-      Dorsal body membranous, with numerous short spinulose club-shaped or crown-shaped processes. ABD TERG 8 with 4 tapering or finger-like processes (e.g. fig. 63B). Antennae of aptera often 5-segmented                                                                                                   .....3


3     Aptera with apical diameter of largest spinal process on ABD TERG V c. 30 μm, about as wide as SIPH pore. Processes are finger-like/tapering only on ABD TERG 8. Alata with ANT III bearing 8-17 secondary rhinaria in a row, and ANT PT/BASE 0.18-0.29

…..Lizerius tuberculatus

-      Aptera with apical diameter of largest spinal process on ABD TERG V c. 20 μm, about 0.5 of width of SIPH pore. Marginal processes are finger-like/tapering on ABD TERG (4-)5-7. Alata with ANT III bearing 15-26 secondary rhinaria scattered all over segment, and ANT PT/BASE 0.30-0.36                                                                               …..Lizerius pustulatus


Octadesmia see Dilomilis                                                 Orchidaceae


Octomeron see Platostoma                                    Lamiaceae


Ocymum see Ocimum                                                         Lamiaceae


ΧOdontioda                                                           Orchidaceae

      ΧOdontioda sp. (hybrid)               Aphis spiraecola


Odontites (including Orthantha)                                   Orobanchaceae

      Odontites lutea                              Brachycaudus mimeuri, persicae

       O. purpureus                                 Brachycaudus helichrysi

       O. serotina = O. vulgaris

          O. sicula                                        Brachycaudus mimeuri     

       O. verna                                         Brachycaudus mimeuri

       O. vulgaris                                     Aphis frangulae; Brachycaudus persicae

Key to apterae on Odontites:-

-      Dorsum with an extensive solid black shield covering almost all of metanotum and ABD TERG 1-6. Cauda short and rounded, not longer than its basal width

                                                              …..Brachycaudus mimeuri (or persicae: see text)

-      Without that combination of characters                          …..go to key to polyphagous aphids


Odontoglossum                                            Orchidaceae

      Odontoglossum sp.                       Sitobion luteum

(or try key to orchid-feeding aphids under Cymbidium)


Odontonema                                                Acanthaceae

      Odontonema strictum                   Myzus persicae


Odontospermum see Asteriscus                                   Compositae


Oedibasis                                                     Apiaceae

      Oedibasis platycarpa                     Aphis craccivora


Oemleria (including Osmaronia)                                  Rosaceae

     Oemleria cerasiformis                  Macrosiphum [euphorbiae], occidentale, osmaroniae

Key to apterae on Oemleria:-

-      R IV +V short and blunt, about as long as its basal width, 0.7-0.8 Χ HT II. ANT BASE VI 1.5-2.3 Χ R IV+V. Cauda with 8-14 hairs                          …..Macrosiphum occidentale

-      R IV+V much longer than its basal width, 0.9-1.1 Χ HT II. ANT BASE VI 1.0-1.5 Χ R IV+V. Cauda with 5-8 hairs                                                                 …..Macrosiphum osmaroniae


Oenanthe                                                     Apiaceae

      Oenanthe aquatica                        Anuraphis subterranea; Aulacorthum solani;

                                                              Cavariella aegopodii; Pemphigus protospirae

       Oe. crocata                                    Aphis fabae; Cavariella aegopodii, pastinacae, theobaldi;

                                                              Hyadaphis passerinii; Macrosiphum euphorbiae;

                                                              Myzus persicae

       Oe. javanica                                  Amphorophora  cryptotaeniae;

                                                              Aphis craccivora, gossypii, spiraecola;

                                                              Brachycaudus helichrysi; Cavariella oenanthi, salicicola;

                                                              [Hyalopterus pruni]; Myzus persicae; Semiaphis heraclei

       Oe. pimpinelloides                         Aphis fabae, spiraecola; Dysaphis apiifolia;

                                                              Hyadaphis passerinii

       Oe. sarmentosa                             Cavariella aegopodii, konoi; Hyadaphis passerinii;

                                                              Pemphigus populicaulis

       Oe. silaifolia                                  Cavariella aegopodii; Macrosiphum euphorbiae

       Oe. stolonifera = Oe. javanica

       Oenanthe spp.                               [Aphis oenanthis Lichtenstein (nomen nudum)];

                                                              Cavariella salicis

Key to apterae on Oenanthe:-

1     ABD TERG 8 with a posteriorly projecting process above cauda bearing 2 hairs (e.g. Fig 10g); in one species (Cavariella oenanthi) this is reduced to a small, warty, knob in the centre of ABD TERG 8, with 2 associated hairs (Fig. 10i)                                                               .....2

-      No supracaudal process, nor are there 2 hairs on ABD TERG 8  close together and associated with a warty knob                                                                                             .....8

2     SIPH clavate; swollen on distal half to at least 1.2 Χ narrowest part of basal half.

       ANT PT/BASE  0.6-2.0                                                                                                     .....3

-      SIPH tapering or cylindrical, or with slight subapical swelling. ANT PT/BASE 1.3-3.5


3     Supracaudal process conical or finger-like, not projecting to tip of cauda                        .....4

-      Supracaudal process large, conical, extending beyond and usually covering cauda          .....6

4      ANT PT/BASE 2.6-4.0                                                                    …..Cavariella pastinacae

-      ANT PT/BASE 0.6-2.0                                                                                                     …..5

5     ANT PT/BASE  0.6-1.3. R IV+V 0.7-0.95 Χ HT II, and without accessory hairs

.….Cavariella aegopodii

-      ANT PT/BASE 1.35-2.0. R IV+V 1.0-1.2 Χ HT II, with 2 accessory hairs

.....Cavariella konoi

6     R IV+V 1.05-1.2 Χ HT II. SIPH short and stout, narrowing only at base

.....Cavariella salicicola

-      R IV+V 0.85-1.04 Χ HT II. SIPH with narrower basal stem extending over about 0.3 of length                                                                                                       …..Cavariella salicis

7     Supracaudal process reduced to a warty knob, distinctly shorter than ANT II (Fig. 10i). Head and Cauda dark, tergum with variably developed dark markings. Secondary rhinaria sometimes present on ANT III-V or IV-V (of aptera). ANT PT/BASE 1.3-1.8. Femoral hairs numerous, long and fine, longer than 0.5 Χ width of hind femur         .....Cavariella oenanthi

-      Supracaudal process at least as long as ANT II. Head and cauda pale, tergum without dark markings. Antennae (of aptera) without secondary rhinaria. ANT PT/BASE 2.1-3.5. Femoral hairs sparse and shorter than 0.5 Χ width of hind femur                     .....Cavariella theobaldi

8     SIPH very small and flangeless; less than 0.5 Χ cauda and often not much longer (1.0-1.8 Χ) than their diameter at midlength                                                           …..Semiaphis heraclei

-      SIPH (if present at all) more than 0.6 Χ cauda, and with a flange                                    …..9

9     Cauda helmet-shaped, a little shorter than its basal width. Spinal tubercles (STu) present on head and at least ABD TERG 8                                                                                     …..10

-      Cauda (if developed at all) tongue- or finger-shaped and distinctly longer than its basal width. STu usually not evident                                                                                       …..11

10   SIPH less than 2 Χ basal width with close-set rows of spinules. Cauda with c.10-12 hairs

…..Anuraphis subterranea

-      SIPH more than 2 Χ basal width with normal imbrication. Cauda with 5 hairs                       

…..Dysaphis apiifolia

11   SIPH and cauda both dark, with SIPH swollen on distal 0.7, and 0.9-1.4 Χ cauda

…..Hyadaphis passerinii

-      Without that combination of characters                                                                          …..12

12   SIPH strongly clavate, with swollen part maximally 1.8-2.1 Χ minimum width on basal part, and with a subapical constriction bearing 2-3 rows of tranverse striae below the well-developed flange. R IV+V 1.5-1.7 Χ HT II. Apex of ANT PT pointed

…..Amphorophora cryptotaeniae

-      Without that combination of characters                           .....go to key to polyphagous aphids


Oenocarpus                                                 Arecaceae

      Oenocarpus distichus                    Cerataphis brasiliensis


Oenothera                                                    Onagraceae

      Oenothera affinis                          Aphis oenotherae

      Oe. amoena = Clarkia amoena        

       Oe. berteroana = Oenothera affinis

       Oe. biennis                                    Anoecia [cornicola], oenotherae, [setariae];

                                                              Aphis fabae, frangulae, gossypii, grossulariae,

                                                                  holoenotherae, nasturtii, oenotherae, oestlundi;

                                                              Aulacorthum solani; Brachycaudus cardui;

                                                              Macrosiphum euphorbiae, gaurae,[pallidum];

                                                              Myzus [biennis], oenotherae, persicae;

                                                              [Pemphigus oenotherae (nomen nudum)];

                                                              [Uroleucon ambrosiae]

       Oe. brevihypanthialis = Oe. deflexa var. brevihypanthialis

       Oe. casimiri                                   Aphis holoenotherae

       Oe. cespitosa = Pachylophis cespitosa

       Oe. deflexa                                    Aphis holoenotherae

                   (incl. var. brevihypanthialis)

       Oe. erythrosepala = Oenothera glazioviana

       Oe. flaemingina                            [Aphis sp. nr. holoenotherae - Rakauskas 2008]

       Oe. flava                                        [Protaphis middletonii]

          Oe. fruticosa = Kneiffia fruticosa

          Oe. glazioviana                              Aphis epilobiaria, oenotherae, spiraecola;

                                                              [Macrosiphum rosae]; Myzus ornatus;

                                                              [Uroleucon nigrotuberculatum]

       Oe. grandiflora = Oenothera glazioviana

       Oe. hazelae var. subterminalis       Aphis holoenotherae

       Oe. javanica                                  Aphis spiraecola

       Oe. lamarckiana                           Aphis holoenotherae, oenotherae

          Oe. missouriensis = Megapterium missouriense                           

       Oe. muricata = Oenothera biennis

       Oe. oakesiana                                Aphis holoenotherae, oenotherae

       Oe. odorata                                    Aphis gossypii, oenotherae, spiraecola;

                                                              Rhopalosiphoninus staphyleae

       Oe. parviflora                                Aphis oenotherae

       Oe. perangusta Χ biennis              Aphis holoenotherae

       Oe. picensis                                   Aphis spiraecola

       Oe. pilosella = Kneiffia pilosella

       Oe. rosea                                       Rhopalosiphoninus staphyleae

       Oe. rubricauloides                         Aphis holoenotherae

       Oe. sarmentosa                             [Cavariella aegopodii]

       Oe. serrulata = Calylophus serrulata

       Oe. spectabilis                                Aphis oenotherae

       Oe. stricta                                      Aphis oenotherae

       Oe. strigosa var. subulifera           Myzus oenotherae

       Oe. stuchii                                     [Aphis sp. nr holoenotherae – Rakauskas 2008]

       Oe. subterminalis = Oenothera hazelae var. subterminalis

       Oe. subulifera = Oenothera strigosa var. subulifera

       Oe. versicolor                                Brachycaudus helichrysi

       Oenothera sp.                                Aphis praeterita, sambuci;

                                                              [Protaphis sp. (Utah, USA; A. Jensen,

Key to apterae on Oenothera:-

1     ANT PT/BASE less than 0.5, with numerous long hairs. SIPH as large pores with surrounding hairs on shallow pigmented cones                                   …..Anoecia oenotherae

-      ANT PT/BASE more than 1.4, with few hairs. SIPH tubular                                          …..2

2     ANT tubercles undeveloped or weakly developed, so that front of head is convex, straight or sinuous in dorsal view                                                                                                       …..3

-      ANT tubercles well developed, so there is a deep frontal sinus in dorsal view              …..16

3     Cauda helmet-shaped, not longer than its basal width, with 4-8 hairs. SIPH have a distinct annular subapical incision. Spiracular apertures are large and rounded. ABD TERG 1 and 7 are without marginal tubercles (MTu)                                                                               …..4

-      Cauda tongue-shaped, as long as or longer than its basal width, with 4-21 hairs. SIPH without a subapical annular incision. Spiracular apertures reniform. ABD TERG 1 and 7 with MTu                                                                                                                                           …..5

4     Dorsal abdomen with an extensive solid black shield. ANT III 0.31-0.47 mm, 2.4-3.4 Χ HT II. R IV+V 0.17-0.24 mm. SIPH dark, imbricated, 1.7-3.4 Χ cauda .....Brachycaudus cardui

-      Dorsal abdomen without a black shield. ANT III 0.07-0.25 mm, 0.9-2.2 Χ HT II. R IV+V 0.10-0.15 mm. SIPH pale, smooth, 0.8-2.0 Χ cauda                    ......Brachycaudus helichrysi

5      Cauda bluntly triangular, about as long as its basal width or only a little longer. ANT III usually with 1-12 rhinaria on distal half                                            …..Protaphis middletonii

-      Cauda tongue-shaped, distinctly longer than its basal width. ANT III without rhinaria (except in alatiform specimens)                                                                                        …..6

6     SIPH 2.2-4.5 Χ cauda, which is black and bears 9-20 hairs. ABD TERG 2-4(-6) as well as 1 and 7 with well-developed MTu                                                                  …..Aphis sambuci

-      SIPH 0.7-2.5 Χ cauda, if more than 2.1 Χ then cauda is pale or dusky and bears fewer hairs. ABD TERG 2-6 with or without small MTu                                                                    …..7

7     SIPH pale. R IV+V 0.13-0.18 mm long, with 5-12 accessory hairs. Cauda with 8-24 hairs


-      SIPH pale, dark, or dark-tipped. R IV+V 0.075-0.145 mm long, with 2 accessory hairs. Cauda with 4-24 hairs                                                                                                     …..11

8     ABD TERG 2-6 mostly with MTu, as well as ABD TERG 1 and 7    …..Aphis grossulariae

-      ABD TERG 2-6 without MTu                                                                                          …..9

9     Tarsi almost completely smooth. Cauda with 16-24 hairs                       …..Aphis epilobiaria

-      Tarsi distinctly imbricated. Cauda with 8-16 hairs                                                         …..10

10   ANT PT/BASE 1.9-2.5 (usually more than 2)                                         …..Aphis oenotherae

-      ANT PT/BASE 1.5-2.3 (usually less than 2)                                      …..Aphis holoenotherae

11   ANT PT/BASE 3.3-4.7. Cauda with 5-8 hairs                                          …..Aphis praeterita

-      ANT PT/BASE 1.2-3.5 (if more than 3.1 then cauda has 11-24 hairs)                           …..12

12   ANT PT/BASE 1.2-1.9. R IV+V 1.35-1.7 Χ HT II. Anterior half of subgenital plate with

       4-6 hairs                                                                                                       …..Aphis oestlundi

-      ANT PT/BASE 1.9-3.5. R IV+V 0.9-1.4 Χ HT II. Anterior half of subgenital plate with

       2-9 hairs                                                                                                                           …..13

13   SIPH pale except at apices                                                                           .….Aphis nasturtii

-      SIPH dark                                                                                                                       …..14

14   SIPH clearly darker than cauda, which bears 4-8 hairs. Longest hind femoral hairs only 0.4-0.7 Χ diameter of trochantro-femoral suture                                                      ......Aphis gossypii

-      Cauda always dark like SIPH, and bearing 7-24 hairs. Longest hind femoral hairs usually more than 0.7 Χ diameter of trochantro-femoral suture                                                            .....15

15   Dorsal abdomen without any dark markings. Cauda usually with a midway constriction, and bearing 7-15 hairs                                                                                       .....Aphis spiraecola

-      Dorsal abdomen with dark bands on ABD TERG 8, or 7 and 8, and often with dark markings anterior to SIPH. Cauda without any midway constriction, and bearing 11-24 hairs

       …..Aphis fabae

16   SIPH with subapical reticulation (at least 4-5 rows of closed polygonal cells). Head smooth, with inner faces of ANT tubercles divergent                                                                  …..17

-      SIPH without subapical polygonal reticulation. Head spiculose, with inner faces of ANT tubercles parallel or apically convergent                                                                          …..18

17   SIPH variably pigmented, often dark distally. ANT VI BASE 0.65-0.95 Χ R IV+V.

       R IV+V 1.1-1.3 Χ HT II                                                                   …..Macrosiphum gaurae

-      SIPH usually pale, or only dusky at apices. ANT VI BASE 0.9-1.3 Χ R IV+V.

       R IV+V 0.85-1.1 Χ HT II                                                          …..Macrosiphum euphorbiae

18   Longest hairs on ANT III more than 0.5 Χ BD III (?). ANT dark beyond basal half of ANT V. SIPH 1.4-1.9 Χ cauda (?)                                 …..Myzus biennis (or oenotherae? - see text)* 

-      Longest hairs on ANT III less than 0.5 Χ BD III. ANT pale except for segmental apices. SIPH 1.9-2.5 Χ cauda                                                                                                      …..19

19   ANT III with (0-) 1-2 (-3) small rhinaria near base. Inner faces of ANT tubercles approximately parallel-sided.  SIPH tapering/cylindrical on distal half                                   

…..Aulacorthum solani

-      ANT III without rhinaria. Inner faces of ANT tubercles apically convergent. SIPH slightly swollen on distal half                                                                                  …..Myzus persicae


Ohwia                                                          Leguminosae

      Ohwia caudata                            Aphis gossypii


Oldenlandia                                                 Rubiaceae

      Oldenlandia corymbosa                Aphis gossypii; Myzus persicae

       O. herbacea                                   Aphis gossypii

       O. sclerophylla                              Aphis gossypii

       Oldenlandia spp.                           [Acyrthosiphon pisum]; Aulacorthum solani;

                                                              [Lipaphis pseudobrassicae]; Myzus cymbalariae;

                                                              Uroleucon compositae

Use key to polyphagous aphids.


Oldfeltia                                                      Compositae

      Oldfeltia polyphlebia see Senecio polyphlebius


Olea                                    Olives                         Oleaceae

      Olea europaea                               Prociphilus oleae; [Tetraneura agnesii del Guercio 1920]



Olearia                                                         Compositae

     Olearia bullata                                [Aphis sp. near coprosmae (New Zealand; Teulon et al.


      O. gunniana                                   Aphis gossypii; [Uroleucon sp. (Leonard 1972a)]

      O. lirata                                           [Uroleucon sp. (Leonard 1972a)]

      O. passerinoides                             Myzus persicae; [Uroleucon sp. (Leonard 1972a)]

      O. pimeleoides                                [Uroleucon sp. (Leonard 1972a)]

      O. viscidula                                     Myzus persicae; [Uroleucon sp. (Leonard 1972a)]

Use key to polyphagous aphids. (Note: the Uroleucon is a large, red, apparently undescribed species.)



Oligostachyum                                                     Poaceae

      Oligostachyum shiuyingianum     Ceratovacuna hoffmanni; Chaitoregma tattakana

Use key to aphids on Arundinaria.



Oligotrichum                                               Polytrichaceae

      Oligotrichum aligerum                 Myzodium modestum

Use key to apterae of moss-feeding aphids under Polytrichum.


Omalotheca                                                 Compositae

      Omalotheca caucasica = Gnaphalium sylvaticum


Oncidium                                                     Orchidaceae

     Oncidium altissimum                     Cerataphis orchidearum; Myzus persicae; Sitobion luteum

      O. cebolleta = Trichocentrum cebolleta

      O. sphacelatum                              Aphis (Toxoptera) aurantii

Use key to apterae on orchids under Cymbidium.


Oncoba                                                        Salicaceae

     Oncoba spinosa                              Aphis (Toxoptera) aurantii; Schoutedenia ralumensis

Key to apterae on Oncoba:-

-      ABD TERG 7 with a pair of long, pointed backwardly-directed processes. SIPH as short broad  cones. ANT 5-segmented. ANT PT/BASE less than 1     Schoutedenia ralumensis

-      ABD TERG 7 without long processes. SIPH tubular, dark, much longer than wide. ANT

       6-segmented, with ANT PT/BASE 3.5-5.0                             ….. Aphis (Toxoptera) aurantii


Oncosiphon                                                 Compositae

      Oncosiphon piluliferum                Aphis craccivora


Onobrychis                                                  Leguminosae

      Onobrychis arenaria ssp. sibirica    Aphis craccivora

      O. argentea ssp. hispanica = O. conferta ssp. hispanica

       O. conferta ssp. hispanica                Aphis craccivora

       O. cyri                                            Aphis craccivora              

      O. gracilis                                      Acyrthosiphon pisum

       O. kachetica                                  Acyrthosiphon pisum; Aphis craccivora, fabae;

                                                              Therioaphis trifolii

       O. micrantha                                 Aphis craccivora

       O. montana                                   Acyrthosiphon pisum; Aphis craccivora

       O. pulchella                                   Aphis craccivora, [ “laburni” (= cytisorum?)]

       O. sativa = O. viciifolia

       O. sibirica = O. arenaria ssp. sibirica 

       O. squarrosa                                  Acyrthosiphon pisum

       O. tanaitica (= O. arenaria)              Aphis craccivora

       O. transcaucasica                          Aphis craccivora

       O. viciifolia                                    Acyrthosiphon loti, pisum;

                                                              Aphis craccivora, fabae, pseudocomosa;

                                                              [Brachycaudus persicae]; Therioaphis trifolii

       Onobrychis sp.                              [Smynthurodes betae]

Key to apterae on Onobrychis:-

1     Fore coxae greatly enlarged. SIPH in form of truncate cones. Cauda knobbed, anal plate bilobed. Dorsal hairs with expanded apices, and arising from pigmented, tuberculate bases

.….Therioaphis trifolii

-      Fore coxae normal. SIPH tubular. Cauda tongue- or finger-shaped, anal plate entire. Dorsal hairs with blunt or pointed apices, not arising from tuberculate bases                              ..…2

2     Body pale, spindle-shaped; BL 2.0-4.4 mm. ANT tubercles well developed with inner faces divergent. SIPH and cauda pale                                                                                        …..3

-      Body oval, with an extensive dark dorsal shield; BL 1.4-2.2 mm. ANT tubercles weakly developed. SIPH and cauda both dark                                                                             …..4

3     ANT I longer than wide and bearing 9-23 hairs. SIPH attenuate distally, thinner than hind tibia at midlength                                                                               …..Acyrthosiphon pisum

-      ANT I not longer than wide, bearing 6-10 hairs. SIPH not attenuate distally, as thick as or thicker than hind tibia at midlength                                                       …..Acyrthosiphon loti

4     Longest ANT hairs 0.67-1.4 Χ ANT BD III. Femoral hairs about as long as trochantro-femoral suture. Cauda with 8-19 hairs (rarely less than 10)               …..Aphis pseudocomosa

-      Longest ANT hairs 0.37-0.75 Χ ANT BD III. Femoral hairs shorter. Cauda with 4-9 hairs

…..Aphis craccivora


Onoclea                                                       Woodsiaceae

      Onoclea sensibilis                        Amphorophora ampullata, ampullata ssp. laingi;

                                                            Aulacorthum solani; Neomyzus circumflexus

       O. struthiopteris see Matteuccia    

Use key to fern-feeding aphids under Polypodium.


Ononis                                                         Leguminosae

      Ononis alba                                 Therioaphis obscura

       O. antiquorum = O. spinosa ssp. antiquorum                               

       O. aragonensis                              Aphis fabae

       O. arvensis = O. spinosa ssp. hircina

       O. austriaca = O. spinosa ssp. austriaca

       O. diffusa                                       Therioaphis ononidis

       O. fruticosa                                    Acyrthosiphon loti, ononis; Aphis brunnea

       O. hircina = O. spinosa ssp. hircina   

       O. leiosperma = O. spinosa ssp. leiosperma

       O. minutissima                              Aphis craccivora; Therioaphis alatina

       O. natrix (incl. sspp.                         Acyrthosiphon pilosum, pisum;

          angustissima, ramosissima)               Aphis brunnea, craccivora, [medicaginis];

                                                              [Myzus persicae]; Therioaphis alatina, natricis, trifolii

       O. pseudohircina = spinosa ssp. hircina

       O. pubescens                                 Aphis brunnea

       O. pusilla                                       Therioaphis alatina

       O. ramosissima = natrix ssp. ramosissima

       O. reclinata                                    Therioaphis obscura

       O. repens                                       Acythrosiphon loti, ononis, pisum; Aphis kaltenbachi;

            (= O. spinosa ssp. procurrens)              Macrosiphum euphorbiae; Therioaphis ononidis, trifolii

       O. repens var. mitis = O. spinosa ssp. hircina

       O. serrata                                       Therioaphis ononidis

       O. spinosa                                      Acyrthosiphon ononis, pilosum, pisum;

          (incl. ssp. antiquorum, austriaca,          Aphis brunnea, craccivora, cytisorum, kaltenbachi,

                     hircina)                                  ?medicaginis;

                                                                  Brachycaudus helichrysi; Macrosiphum euphorbiae;

                                                              [Myzus sp. (Bozhko 1976a)];

                                                              Therioaphis alatina, hungarica, natricis, obscura,

                                                                  ononidis, trifolii

       O. stenophylla                               Therioaphis natricis

       O. tridentata                                  Aphis cytisorum, kaltenbachi, ononidis

       O. viscosa                                      Aphis brunnea; Therioaphis alatina

Key to apterae on Ononis:-

(Couplets 1-3 can be applied to alatae as well as apterae.)

1     Fore coxae greatly enlarged. SIPH in form of truncate cones. Cauda knobbed, anal plate bilobed. Dorsal hairs with expanded apices, and arising from tuberculate bases that are often pigmented                                                                                                                          .….2

-      Fore coxae normal. SIPH tubular. Cauda tongue- or finger-shaped, anal plate entire. Dorsal hairs with blunt or pointed apices, not arising from tuberculate bases                              ..…7

2     ABD TERG 1-4 each bearing 7-10 (mostly 8) long hairs                      …..Therioaphis trifolii

-      ABD TERG 1-4 each with 4 long hairs (one spinal pair and one marginal pair; occasionally there are also one or two much smaller hairs)                                                                    …..3

3     R IV+V distinctly longer than HT II, and bearing 8-27 accessory hairs                          …..4

-      R IV+V 0.7-0.95 Χ HT II, and bearing 2-8 (-9) accessory hairs                                       …..6

4     All adult viviparae alate. ABD TERG 8 with 2 (-3) hairs. (R IV+V with 17-25 accessory hairs)                                                                                                    …..Therioaphis alatina

-      Predominant morph apterous. ABD TERG 8 with 4-6 hairs                                            …..5

5     R IV+V with 14-27 accessory hairs                                                    …..Therioaphis natricis

-      R IV+V with 8-12 accessory hairs                                                     …..Therioaphis ononidis

6     ABD TERG 1-7 with very large paired variably pigmented sclerotic cross-bars, often fused across midline. R IV+V with 2-4 accessory hairs                               …..Therioaphis obscura

-      ABD TERG 1-7 with hairs arising from separate sclerotic plates that are rarely fused across midline. R IV+V with 6-9 accessory hairs                                      …..Therioaphis hungarica

7     Body spindle-shaped. ANT tubercles well developed, with inner faces smooth and divergent. ANT often longer than BL                                                                                                …..8

-      Body oval. ANT tubercles undeveloped or weakly developed, ANT shorter than BL  …..12

8     SIPH with subapical polygonal reticulation. Longest hairs on ANT III more than 0.5 Χ basal diameter of segment                                                                   …..Macrosiphum euphorbiae

-      SIPH without subapical polygonal reticulation. Longest hairs on ANT III usually less than 0.5 Χ basal diameter of segment                                                                                        …..9

9     R IV+V with 19-36 accessory hairs. First tarsal segments usually with 5 hairs. Prominent marginal tubercles present on several of ABD TERG 2-4(-5)        …..Acyrthosiphon pilosum

-      R IV+V with 3-12 accessory hairs. First tarsal segments with 3 hairs. Abdominal marginal tubercles either absent or small and inconspicuous                                                         …..10

10   ANT I with 6-9 hairs. ANT BASE VI 1-1.5 Χ longer than R IV+V. SIPH not attenuate distally; diameter at midlength greater than middle diameter of hind tibia                             

..…Acyrthosiphon loti

-      ANT I with 9-23 hairs. ANT BASE VI 1.6-2.9 Χ longer than R IV+V. SIPH attenuate distally, with diameter at midlength similar to or less than middle diameter of hind tibia           ..…11

11   ANT VI BASE 1.6-1.9 Χ R IV+V, which bears (6-) 8-12 accessory hairs. R IV+V 0.75-0.95 Χ HT II. Cauda with 11-23 hairs                                                      …..Acyrthosiphon ononis

-      ANT VI BASE 1.9-2.9 Χ R IV+V which bears 3-7 (-8) accessory hairs. R IV+V 0.67-0.85 Χ HT II. Cauda with 8-14 hairs                                                             …..Acyrthosiphon pisum

12   Cauda helmet-shaped, not longer than its basal width. SIPH pale, smooth, with a subapical annular incision. Spiracular apertures large and rounded. ABD TERG 1 and 7 without marginal tubercles (MTu). Dorsal abdomen without dark markings

…..Brachycaudus helichrysi

-      Cauda tongue- or finger-shaped, longer than its basal width. SIPH dark, imbricated, without a subapical annular incision. Spiracular apertures reniform. ABD TERG 1 and 7 always with MTu. Dorsal abdomen usually with dark markings                                                         …..13

13   SIPH very short, flangeless, 0.2-0.3 Χ cauda. Dorsum usually with a solid dark shield from metanotum to ABD TERG VI                                                                …..Aphis kaltenbachi

-      SIPH with a distinct flange, and at least 0.8 Χ cauda. Dorsum with or without a solid dark shield                                                                                                                               …..14

14   Very short haired; hairs on ABD TERG 8 are 11-16 μm, and on ABD TERG 3 marginally 11-12 μm. Posterior hair on hind trochanter 16-24 μm, 0.29-0.52 Χ length of

       trochantro-femoral suture                                                      …..Aphis ?medicaginis (see text)

-      Longer haired; hairs on ABD TERG 8 are 18-85 μm, and on ABD TERG 3 marginally 12-85 μm. Posterior hair on hind trochanter (0.34-) 0.5-2.0 Χ length of trochantro-femoral suture


15   ABD TERG 1-4 and 7, and sometimes also 5 and 6, with MTu. R IV+V 1.1-1.45 Χ HT II and bearing 2-6 (usually 4-5) accessory hairs                                                      …..Aphis brunnea

-      MTu only sporadically present on ABD TERG 2-4.  R IV+V 0.9-1.2 Χ HT II, with 2 accessory hairs                                                                                                                 …..16

16    Cauda with 11-25 hairs. Dorsal abdomen usually with a few small dark spots anterior to SIPH

…..Aphis fabae

-      Cauda with 4-13 hairs. Dorsal abdomen usually with extensive dark sclerotisation      …..17

17   R IV+V 0.88-1.16 Χ HT II (mostly 0.9-1.05 Χ). Anterior half of genital plate with 2 (-3) hairs

…..Aphis craccivora

 -     R IV+V  0.97-1.3 Χ HT II (mostly 1.06-1.2 Χ). Anterior half of genital plate with 2-8 hairs (mode 4, mean 5.2)                                                                                   …..Aphis cytisorum


Onopordum                                                 Compositae

      Onopordum acanthium                Aphis craccivora, fabae, gossypii, solanella, [symphyti];

                                                              Brachycaudus cardui, cardui ssp. turanica, helichrysi;

                                                              Capitophorus carduinus, elaeagni;

                                                              Dysaphis lappae ssp. cynarae; Macrosiphum euphorbiae;

                                                              Myzus persicae;

                                                              Protaphis anuraphoides, [elongata], pseudocardui,


                                                              Trama troglodytes;

                                                              Uroleucon aeneum, bicolor (?), [sonchi]

       O. anisacanthum = O. heteracanthum

       O. davisii                                        Aphis craccivora, spiraecola; Brachycaudus cardui

       O. heteracanthum                         Aphis fabae; Myzus persicae

       O. illyricum                                   Aphis fabae; Brachycaudus cardui, helichrysi;

                                                              Uroleucon aeneum, [sonchi]

       O. leptolepis                                   [Protaphis carthami]

       O. nervosum                                  Brachycaudus cardui

       O. olgae                                         Pemphigus bursarius; Rectinasus buxtoni;

                                                              Smynthurodes betae

       O. sibthorpianum                          Protaphis terricola  

       O. tauricum                                   Brachycaudus cardui

Key to apterae on Onopordum:-

1     SIPH absent. ANT PT/BASE less than 0.5. Eyes reduced, often to triommatidia          …..2

-      SIPH present. ANT PT/BASE more than 0.6. Eyes well-developed                               …..5

2     Body and antennae sparsely hairy. Wax glands present on ABD TERG 3-7

…..Pemphigus bursarius

-      Body and antennae densely hairy, e.g. base of last antennal segment with more than 20 hairs. Wax glands absent or inconspicuous                                                                                 …..3

3     HT II elongate, at least 0.5 Χ hind tibia. ANT 6-segmented                 …..Trama troglodytes

-      HT II of normal length. ANT 5-segmented                                                                      …..4

4     ANT V BASE and R IV+V both very long, respectively about 1.7 and 2.5 Χ width of head between antennal bases. ANT II similar in length to ANT I, much shorter than III

.….Rectinasus buxtoni

-      ANT V BASE and R IV+V of normal length , both about 0.5 Χ width of head between antennal bases. ANT II about twice as long as ANT I, similar in length to III                       

..…Smynthurodes betae

5     Cauda short, helmet-shaped or bluntly triangular, shorter than or not clearly longer than its basal width in dorsal view                                                                                                  .....6

-      Cauda elongate triangular, tongue-or finger-shaped, clearly longer than its basal width in dorsal view                                                                                                                       .....11

6     ANT PT/BASE  0.75-1.15. Cauda bluntly triangular with 10-24 hairs. ABD TERG 1 and 7 with well-developed marginal tubercles (MTu)                                                                 .....7

-      ANT PT/BASE 2.3-5.1. Cauda helmet-shaped, with 5-8 hairs. If ABD TERG 1 and 7 have MTu then these are also present on ABD TERG 2-5                                                        …..9

7     ANT III usually without secondary rhinaria (rarely with 1-3). (Longest hairs on ABD TERG 3 are 0.7-1.1 Χ ANT BD III)                                                         …..Protaphis pseudocardui

-      ANT III and IV usually with rhinaria (0-12 on III and 0-4 on IV)                                   .....8

8     Longest hairs on ABD TERG 3 are 1.2-1.3 Χ ANT BD III. SIPH 0.9-1.2 Χ cauda, and with a distinct flange. R IV+V 1.45-1.65 Χ HT II                               …..Protaphis anuraphoides

-      Longest hairs on ABD TERG 3 are 0.3-0.9 Χ ANT BD III. SIPH 0.67-0.92 Χ cauda, with a weak flange . R IV+V 1.2-1.4 (-1.5) Χ HT II                                      …...Protaphis terricola

9     Dorsal abdomen with an extensive solid black patch. SIPH 0.10-0.15 Χ BL. Mesosternum with a pair of dark mammariform processes                                      .....Brachycaudus cardui

-      Dorsal abdomen without a solid black patch, at most with scattered dark markings. SIPH 0.05-0.10 Χ BL. Mesosternum without mammariform processes                                    .....10

10   BL 0.9-2.0 mm.  SIPH smooth, short and broad-based, 1.5-2.0 Χ their diameter at  midlength. Spinal and marginal tubercles (STu and MTu) rare or absent

 ......Brachycaudus helichrysi

-      BL 2.1-3.0 mm. SIPH imbricated and about 3 Χ their diameter at midlength. Numerous

       well-developed STu and MTu present                                  .....Dysaphis lappae ssp. cynarae

11   Hairs on front of head and dorsal body mostly long and capitate, and arising from tuberculate bases                                                                                                              .....12

-     Hairs on front of head and dorsal body not capitate                                                        .....13

12   Cauda 1.1-1.5 Χ R IV+V, and bearing 5-8 hairs. ANT PT 3.1-4.4 Χ R IV+V, and ANT PT/BASE 4.6-6.3. SIPH without dark apices                               …..Capitophorus carduinus

-      Cauda 1.4-2.3 Χ R IV+V, and bearing 7-13 hairs. ANT PT 4.5-6.3 Χ R IV+V, and ANT PT/BASE 6.0-9.2. SIPH with dark apices                                      …..Capitophorus elaeagni

13   BL 3.5-5.0 mm. ANT III with 17-45 rhinaria. SIPH dark, with reticulation extending over distal 0.15-0.25 of length                                                                                                …..14

-      BL less than 3.5, and other characters not in that combination

…..go to key to polyphagous aphids

14   Cauda black. ABD TERG 2-4 consistently with well-developed MTu. R IV+V 1.2-1.3 Χ HT II                                                                                                           …..Uroleucon aeneum

-      Cauda pale.  ABD TERG 2-3 irregularly with very small MTu. R IV+V 0.79-0.84 Χ HT II

…..Uroleucon bicolor (? – see text)



Onosma                                                        Boraginaceae

      Onosma stellulata                         Brachycaudus cardui


Onosmodium                                               Boraginaceae

      Onosmodium bejariense            

                         var. occidentale    Brachycaudus helichrysi


Onychium                                                    Adiantaceae

      Onychium japonicum                   Idiopterus nephrelepidis


Ophiopogon                                                 Asparagaceae

      Ophiopogon japonicus                  Hydronaphis sp. (Japan – Moritsu 1983)


Ophiorrhiza                                                 Rubiaceae

      Ophiorrhiza sp.                             Aphis spiraecola


Ophiuros                                                      Poaceae

      Ophiuros exaltatus                        [Iowana zhangi]; Rhopalosiphum maidis


Ophrys                                                         Orchidaceae

      Ophrys apifera                              Aphis fabae

      O. fusca                                         Dysaphis neostroyani

       O. sphegodes (incl. arenifera)           Aphis fabae

       O. Χtodaroana                               Aphis fabae

Use key to apterae of orchid-feeding aphids under Cymbidium.


Oplismenus                                                  Poaceae

      Oplismenus burmannii                 Hysteroneura setariae; Tetraneura fusiformis

       O. compositus                                Asiphonella dactyloni; [Ceratovacuna nekoashi];

                                                              [Hyalomyzus raoi]; Hysteroneura setariae;

                                                              Micromyzodium spinulosum; Pentalonia gavarri;

                                                              Pseudoregma panicola; Sitobion miscanthi

       O. hirtellus                                     Pseudoregma panicola

       O. imbecillis = O. hirtellus

       O. setarius = O. compositus

       O. undulatifolius                           [Ceratovacuna nekoashi]; Pseudoregma panicola;

                                                              Sitobion akebiae

       Oplismenus spp.                           Baizongia pistaciae; Ceratovacuna lanigera;

                                                              [Pseudoregma koshunensis]

Use key to apterae of grass-feeding aphids under Digitaria.


Oplopanax                                                   Araliaceae

      Oplopanax horridum                    Aphis asclepiadis; Macrosiphum euphorbiae

Use  key to polyphagous aphids.


Opopanax                                                    Apiaceae

      Opopanax chironius                     Anuraphis pyrilaseri, shaposhnikovi; Aphis fabae;

                                                              Dysaphis apiifolia

Key to apterae on Opopanax:-

(All 4 species have undeveloped or weakly-developed ANT tubercles, dark SIPH, dark cross-bands on ABD TERG 8 or 7-8, and usually some scattered dark markings on ABD TERG 1-6.)

1     Cauda distinctly longer than its basal width. Spinal tubercles (STu) absent, abdominal marginal tubercles (MTu) consistently present only on ABD TERG 1 and 7  …..Aphis fabae

-      Cauda helmet-shaped, a little shorter than its basal width. STu present on head and at least some ABD TERG, and MTu on ABD TERG 1-5 or 1-7                                                  …..2

2     R IV+V much shorter than SIPH. SIPH more than 3 Χ basal width with normal imbrication. Cauda with 5 hairs                                                                                  …..Dysaphis apiifolia

-      R IV+V longer than SIPH. SIPH less than 2.5 Χ basal width with close-set rows of spinules. Cauda with 11-18 hairs                                                                                                     …..3

3     MTu on ABD TERG 1-5 only. R IV+V 1.6-2.1 Χ HT II                   …..Anuraphis pyrilaseri

-      MTu on ABD TERG 1-7. R IV+V 1.2-1.6 Χ HT II                   …..Anuraphis shaposhnikovi


Opulaster                                                               Rosaceae

      Opulaster malvaceus                     Utamphorophora humboldti

       O. opulifolius                                 Aphis neilliae, [pomi], spiraecola;

                                                              [Chaetosiphon tetrarhodum]; Rhopalosiphum padi;

                                                              Utamphorophora humboldti;

                                                              [aphid gall – Wahlgren 1956, 51]

See key to apterae under Physocarpus.


Opuntia                                                        Cactaceae

     Opuntia aurantiaca                        Protaphis middletonii

     O. dillenii                                        Aphis gossypii

      O. ficus-indica                                Aphis craccivora, fabae; Myzus persicae;

                                                              Protaphis middletonii

      O. inermis = O. stricta

      O. stricta                                         Pentalonia nigronervosa; Protaphis middletonii

      O. vulgaris = O. ficus-indica

      Opuntia sp.                                     Aphis gossypii

Key to apterae on Opuntia:-

-      ANT longer than BL, with ANT PT/BASE 5-8. Femora with basal 0.6 or more of length pale, rest contrastingly black. SIPH pale basally and dark distally. (Al. with broad-banded wing-veins, and radius fused with media to form a closed cell below pterostigma)

…..Pentalonia nigronervosa

-      Without that combination of characters                          …..go to key to polyphagous aphids


Orchis                                                          Orchidaceae

      Orchis anthropophora                  Aphis fabae

      O. coriophora = Anacamptis coriophora

       O. purpurea                                   Aphis orchidis

      Orchis spp.                                    Aulacorthum solani; Dysaphis neostroyani;

                                                              Myzus persicae; Neomyzus circumflexus

Use key to apterae of orchid-feeding aphids under Cymbidium.


Oreocnide (including Villebrunea)                                Urticaceae

     Oreocnide frutescens                      Aulacorthum solani

     O. integrifolia                                 [Greenidea bucktonis]


Oreopanax                                                   Araliaceae

      Oreopanax guatemalensis            Myzus persicae


Origanum (including Majorana)                                  Lamiaceae

      Origanum compactum                 Aphis sp. near gossypii

       O. creticum = O. vulgare

       O. heracleoticum = O. vulgare ssp. viridulum

      O. majorana (= Majorana                Myzus ornatus; Neomyzus circumflexus


       O. Χpaniculatum                           Aphis origani

       O. syriacum                                   Eucarazzia elegans

       O. tyttanthum = O. vulgare ssp. gracile

       O. virens = O. vulgare ssp. virens

       O. vulgare (incl. sspp. gracile,            Aphis fabae, gossypii, nasturtii, origani;

                             virens, viridulum)         Aulacorthum solani; Kaltenbachiella pallida;

                                                              Myzus ornatus, persicae; [Ovatomyzus chamaedrys];

                                                              Ovatus crataegarius

Key to apterae on Origanum:-

1     ANT usually 4-segmented, 0.12-0.15 Χ BL, with PT/BASE less than 0.5. Eyes 3-facetted. SIPH absent. Legs very short, with fore- and mid-tarsi usually 1-segmented. Dorsal wax glands present on head, thorax and ABD TERG 1-8, comprising facets surrounding an elongate central area                                                                       …..Kaltenbachiella pallida

-      ANT 5- or 6-segmented, more than 0.5 Χ BL, with PT/BASE more than 1. Eyes multifacetted, SIPH present, tarsi 2-segmented and wax glands not evident                  …..2

2     SIPH strongly swollen, 5.4-8.2 Χ cauda, with maximum diameter of swollen part more than 2 Χ minimum diameter of stem, smooth except for a little subapical polygonal reticulation

…..Eucarazzia elegans

-      SIPH not swollen or much less swollen, and less than 3.5 Χ cauda                                  …..3

3     Head smooth, ANT tubercles weakly developed. Marginal tubercles (MTu) present on ABD TERG 1 and 7                                                                                                                   …..4

-      Head spiculose with well-developed ANT tubercles, their inner faces spiculose or scabrous and steep-sided. MTu absent from ABD TERG 1 and 7                                                 …..7

4     SIPH pale with dark apices                                                                          …..Aphis nasturtii

-      SIPH wholly dark                                                                                                             …..5

5     Cauda with 11-24 hairs. Hairs on ANT III 0.8-3.4 Χ BD III                          …..Aphis fabae

-      Cauda with 4-8 hairs. Hairs on ANT III 0.3-0.7 Χ BD III                                               …..6

6    SIPH 0.10-0.12 Χ BL, 1.05-1.45 Χ cauda. ABD TERG 7 and 8 usually with dark cross-bands

…..Aphis origani

-     SIPH 0.12-0.26 Χ BL, 1.3-2.5 Χ cauda. ABD TERG 7 and 8 rarely with dark cross-bands

…..Aphis gossypii

7     Dorsal abdomen without any dark markings                                                                    …..8

-      Dorsal abdomen with dark markings                                                                              …..10

8     SIPH slightly but distinctly swollen on distal half. ANT 0.7-1.0 Χ BL     …..Myzus persicae

-      SIPH tapering/cylindrical on distal half. ANT 1.1-1.5 Χ BL                                            …..9

9     Inner faces of ANT tubercles with convergent, rounded, scabrous processes. ANT III without rhinaria. ANT PT/BASE 5.2-7.6. R IV+V 1.3-1.6 Χ HT II, with 2-4 accessory hairs

…..Ovatus crataegarius

-      Inner faces of ANT tubercles without processes, approximately parallel. ANT III usually with 1-2 small rhinaria near base. ANT PT/BASE 4.0-5.4. R IV+V 1.1-1.4 Χ HT II, with 5-7 accessory hairs                                                                                      …..Aulacorthum solani

10   Dorsal abdomen with a large, roughly U-shaped black patch. ANT PT/BASE 4.3-5.2

…..Neomyzus circumflexus

-      Dorsal abdomen with a pattern of dark intersegmental markings. ANT PT/BASE 1.7-2.8

…..Myzus ornatus


Orixa                                                            Rutaceae

      Orixa japonica                              ?Aulacorthum ?solani (as Myzus kusaki Shinji);

                                                              Pseudomegoura magnoliae

Use key to polyphagous aphids.


Orlaya                                                          Apiaceae

      Orlaya grandiflora                        Aphis solanella; Cavariella theobaldi; Dysaphis crataegi;

                                                              Hyadaphis passerinii

Key to apterae on Orlaya:-

1     SIPH dark, clavate and about equal in length to the dark cauda      …..Hyadaphis passerinii

-      SIPH pale or dark, tapering/cylindrical, longer than cauda, which may also be pale or dark


2     ABD TERG 8 with a backwardly-pointed process bearing 2 hairs    …..Cavariella theobaldi

-      No process on ABD TERG 8                                                                                            …..3

3     Cauda helmet-shaped, not longer than its basal width, usually with 5 hairs. Spinal tubercles (STu) present on head and ABD TERG 8 or, 7 and 8, and marginal tubercles (MTu) on ABD TERG 1-5, but not usually on 7                                                              .....Dysaphis crataegi

-      Cauda tongue-shaped, longer than its basal width, with 11-23 hairs. STu absent, and MTu only regularly present on ABD TERG 1 and 7             .....Aphis fabae group (incl. solanella)


Ormenis see Chamaemelum                                             Compositae


Ornithidium                                                 Orchidaceae

     Ornithidium adendrobium             Cerataphis orchidearum


Ornithogalum                                              Asparagaceae

      Ornithogalum dubium                  Aphis gossypii

      Ornithogalum spp.                       Myzus persicae; Rhopalosiphum nymphaeae, padi

Key to apterae on Ornithogalum:-

-      Dorsal cuticle with a pattern of spinules arranged in polygons, with 1-3 spicules in the centre of each polygon. SIPH clavate                                               …..Rhopalosiphum nymphaeae

-      Without the above combination of characters; if dorsal cuticle has a pattern of spinules arranged in polygons then SIPH not clavate                  …..go to key to polyphagous aphids



Ornithopus                                                  Leguminosae

      Ornithopus compressus                Aphis craccivora

       O. isthmocarpus = O. sativus ssp. isthmocarpus

      O. perpusillus                                Acyrthosiphon pisum; Aphis craccivora

       O. sativus (incl. ssp. isthmocarpus)      Aphis craccivora

Key to apterae on Ornithopus:-

-      Body oval, with an extensive black sclerotic dorsal shield, BL 1.4-2.2 mm. SIPH and cauda black                                                                                                         …..Aphis craccivora

-      Body spindle-shaped, pale, BL 2.5-4.4 mm. SIPH and cauda pale. (Additional check - ANT VI BASE 0.25-0.4 mm, 1.8-2.3 Χ R IV+V – otherwise go to key to polyphagous aphids)

…..Acyrthosiphon pisum



Orobanche (including Aphyllon)                                  Orobanchaceae

      Orobanche aegyptiaca                  Aphis gossypii, [Aphis sp. (Davletshina 1964)];

                                                              Rectinasus buxtoni; Smynthurodes betae

       O. foetida                                       [Geoica utricularia]

       O. crenata                                      Smynthurodes betae

       O. hederae                                     Macrosiphum euphorbiae

       O. lutea                                          [Aphis orobanches]

       O. mutelii                                       [Aphis orobanches]

       O. ramosa                                      [Aphis orobanches]; [Dysaphis candicans];

                                                              [Brachycaudus cardui (? – as Aphis phelipaeae Passerini)]

       O. variegata                                   Smynthurodes betae

       Orobanche sp.                               [Anuraphis subterranea]; Protaphis middletonii;

                                                              [Siphonophora orobanches Lichtenstein (nomen nudum)];

                                                              Myzus persicae; Rhopalosiphum rufiabdominale;

                                                              Trama orobanches

Key to apterae on Orobanche:-

[Only the original descriptions of Aphis orobanches and Dysaphis candicans are available (Passerini 1879), and are insufficient to include these species in the key; see text under these names for further information.]

1     ANT 5-segmented, with ANT V BASE very long, more than 15 Χ longer than the short

       peg-like PT. R IV+V extremely long, similar in length to hind femur  …..Rectinasus buxtoni

-      ANT 5- or 6-segmented, base of last segment and R IV+V relatively much shorter       …..2

2     HT II greatly elongated, more than 0.5 Χ hind tibia                             …..Trama orobanches

-      HT II of normal length                                                                                                      …..3

3     Thoracic spiracles greatly enlarged, rounded, much larger than abdominal spiracles. ANT PT/BASE 7.0-11.4, usually more than 8.0. ANT III with 14-36 rhinaria

…..Nasonovia ribisnigri

-      Thoracic spiracles similar in size to abdominal ones. ANT PT/BASE less than 6. ANT III with 0-10 rhinaria                                                            …..go to key to polyphagous aphids


Orostachys                                                   Crassulaceae

      Orostachys spinosa                       Aphis sedi


Ortantha see Odontites                                                           Orobanchaceae


Orthilia (including Ramischia)                                      Ericaceae

      Orthilia secunda                            Aulacorthum pirolacearum


Orthocarpus                                                Orobanchaceae

      Orthocarpus luteus                       Nasonovia alpina

       O. purpurascens                            Macrosiphum orthocarpus

                       (= Castelleja exserta)

Key to apterae on Orthocarpus:-

-      BL 1.9-2.5 mm. ANT III-V dark only at apices, and SIPH pale or uniformly pigmented, without subapical polygonal reticulation. (Also check: thoracic spiracular apertures much larger than abdominal ones, which are almost covered by cowl-like opercula. R IV+V

       1.6-2.1 Χ HT II with 12-18 accessory hairs)                                           …..Nasonovia alpina

-      BL more than 3 mm. ANT black beyond basal part of  III. SIPH black on distal c.0.7 (and with subapical reticulation?)                                                   …..Macrosiphum orthocarpus*


Orthostemon = Acca                                                         Myrtaceae


Oryza                                                           Poaceae

      Oryza sativa                                   Anoecia corni, fulviabdominalis; Aphis gossypii;

                                                              Brachysiphoniella montana; Chaetogeoica polychaeta;

                                                              Diuraphis noxia; Forda orientalis;

                                                              Geoica lucifuga, setulosa, utricularia;

                                                              Hyalopterus amygdali; Hysteroneura setariae;

                                                              Melanaphis sacchari; Metopolophium dirhodum;

                                                              Paracletus cimiciformis; [Prociphilus sp.];

                                                              Rhopalosiphum maidis, nymphaeae, padi, rufiabdominale,


                                                              Schizaphis graminum; Sipha flava, glyceriae, maydis;

                                                              Sitobion akebiae, avenae, graminis, miscanthi;

                                                              Tetraneura basui, fusiformis, javensis, nigriabdominalis,

                                                                 radicicola, ulmi

Use key to apterae of grass-feeding aphids under Digitaria, or for a simple key to common aphids on rice see Blackman & Eastop 2000.


Oryzopsis (including Eriocoma, Piptantherum)                Poaceae

      Oryzopsis cuspidata = O. hymenoides

          O. hymenoides                              Forda marginata

      O. lateralis                                      Sitobion himalayensis

      O. miliacea                                     Melanaphis sacchari; Myzus persicae; Sitobion avenae

Use key to apterae of grass-feeding aphids under Digitaria.


Osbeckia                                                      Melastomataceae

       Osbeckia capitata                          Aphis gossypii, nasturtii; [Capitophorus carduinus];

                                                              Myzus ornatus, persicae

       O. chinensis                                   Aphis nasturtii; Brachycaudus helichrysi;

                                                              [Rhopalosiphum rufiabdominale]

       O. crinata                                      Aphis aurantii, gossypii; [Capitophorus sp.];

                                                              Myzus persicae

Use key to polyphagous aphids.



Osmanthus                                                                            Oleaceae

       Osmanthus aquifolius                   Prociphilus osmanthae

       O. asiaticus                                    [Shivaphis hangzhouensis]

       O. aurantiacus                              Prociphilus osmanthae

       O. aurantiacus var. thunbergii        Pseudomegoura magnoliae

       O. heterophyllus                            Prociphilus osmanthae

       O. insularis                                    Aphis odinae

-      SIPH absent. ANT PT/BASE less than 1                                       …..Prociphilus osmanthae

-       SIPH present. ANT PT/BASE more than 1                   …..go to key to polyphagous aphids


Osmaronia see Oemleria                                                  Rosaceae


Osmia see Eupatorium                                                        Compositae


Osmorhiza                                                   Apiaceae

      Osmorhiza aristata                        Aphis fabae; Cavariella aegopodii, theobaldi;

                    (incl. var. longistylis)             Semiaphis heraclei; [Uroleucon parvotuberculatum]

       O. chilensis                                    Macrosiphum euphorbiae; Myzus ascalonicus;

                                                              [Rhopalosiphoninus staphyleae]

       O. claytoni = O. aristata                  

       O. longistylis see aristata

      Osmorhiza sp.                               Aphis asclepiadis             

Use key to apterae on Apium.


Osmunda                                                     Osmundaceae

      O. cinnamomea                            Amphorophora ampullata ssp. laingi

       O. japonica                                    Amphorophora ampullata; Aulacorthum solani;

                                                              Taiwanomyzus babai, filicis

       O. regalis                                       Aulacorthum solani; Macrosiphum walkeri;

                                                              Micromyzella pterisoides; Neomyzus circumflexus

       Osmunda sp.                                 Macrosiphum euphorbiae

Use key to apterae on ferns under Polypodium.


Osmundastrum                                            Osmundaceae

      Osmundastrum asiaticum            Micromyzus nikkoensis, osmundae

      O. claytonianum                           Micromyzus osmundae

Use key to apterae on ferns under Polypodium.


Osteomeles                                                  Rosaceae

      Osteomeles schwerinae                 Myzus persicae

       O. subrotunda                               Aphis gossypii

Use key to polyphagous aphids.


Osteospermum                                             Compositae

     Osteospermum ecklonis                 Macrosiphum euphorbiae; Uroleucon compositae

      O. moniliferum = Chrysanthemoides monilifera

      O. spinescens                                  Aphis craccivora

      O. vaillantii = Tripteris vaillantii

Use key to polyphagous aphids.


Ostericum                                                    Apiaceae

      Ostericum melanotilingia = Angelica decursiva


Ostrya                  Hop-hornbeams          Corylaceae

     Ostrya carpinifolia                          Pterocallis ostryae

     O. japonica                                     Mesocallis pteleae

     O. virginiana                                  Macrosiphum (Neocorylobium) pseudocoryli

Key to aphids on Ostrya:-

1     SIPH long, tubular, dark, with subapical zone of polygonal reticulation. Cauda long and tongue-shaped, anal plate entire. ANT PT/BASE more than 5                                                

.....Macrosiphum (Neocorylobium) pseudocoryli

-      SIPH as short, truncated cones. Cauda knobbed, anal plate bilobed. ANT PT/BASE 1.2 or less


2     ANT III of alata dark, with 7-14 secondary rhinaria. ANT PT/BASE 0.9-1.2  

.....Mesocallis pteleae

-      ANT III of alata pale with 4-7 secondary rhinaria. ANT PT/BASE 0.3-0.6                            

.....Pterocallis ostryae



Ostryoderris = Aganope                                                   Leguminosae



Ostryopsis                                                                              Betulaceae

       Ostryopsis davidiana                     Corylobium avellanae



Othonna (including Hertia, Othonnopsis)                        Compositae

     Othonna cheirifolia                        Macrosiphum euphorbiae


Othonnopsis see Othonna                                               Compositae


Otites see Silene                                                                     Caryophyllaceae


Otochilus                                                     Orchidaceae

      Otochilus porrectus                       Sitobion indicum, luteum

Use key to apterae on orchids under Cymbidium.


Ottelia                                                          Hydrocharitaceae

      Ottelia alismoidis                           Rhopalosiphum nymphaeae


Ourisia                                                         Plantaginaceae

      Ourisia microphylla                      Neomyzus circumflexus


Ourouparia see Uncaria                                                      Rubiaceae


Oxalis                                                          Oxalidaceae

      Oxalis acetosella                            Aphis nasturtii; Aulacorthum solani;

                                                              [Hyperomyzus lactucae]; [Jacksonia papillata];

                                                              [Metopolophium frisicum]; Myzus ascalonicus,  persicae;

                                                              Rhopalosiphoninus staphyleae

       O. articulata                                  Myzus ornatus; Neomyzus circumflexus

       O. cernua = O. pes-caprae

       O. corniculata                               Aphis aurantii, craccivora, gossypii, nasturtii, spiraecola;

                                                              Aulacorthum solani; Brachycaudus helichrysi;

                                                              Macrosiphum euphorbiae;

                                                              Myzus cymbalariae, ornatus, persicae;

                                                              Indomasonaphis anaphalidis; Neomyzus circumflexus;

                                                              Neotoxoptera oliveri;

                                                              Rhopalosiphoninus latysiphon, staphyleae

       O. debilis var. corymbosa             Aphis fabae; Myzus persicae

       O. deppei                                       Aphis fabae; Neomyzus circumflexus

       O. enneaphylla                              Myzus ascalonicus

       O. latifolia                                      Aphis gossypii; Macrosiphum euphorbiae;

                                                              [Micromyzodium filicium]; Myzus persicae

       O. laxa                                           Myzus cymbalariae

       O. martiana = O. debilis var. corymbosa

       O. oregana                                    Macrosiphum sp. (Oregon, USA; BMNH collection, leg. D.

                                                                   Hille Ris Lambers);

                                                              Rhopalosiphoninus staphyleae

       O. pes-caprae                                Aphis aurantii, craccivora, fabae, gossypii, solanella,


                                                              Aulacorthum solani;

                                                              Macrosiphum euphorbiae; Myzus persicae;

                                                              Rhopalosiphoninus staphyleae

       O. purpurea                                   Myzus persicae

       O. rosea                                         Myzus persicae; Neomyzus circumflexus

       O. semiloba                                   Aphis gossypii; Myzus persicae

       O. stricta                                        Abstrusomyzus reticulatus; Protaphis middletonii

       O. trilliifolia                                   Myzus ornatus, persicae

       O. variabilis = O. purpurea

       O. versicolor                                  Aphis fabae

       O. violacea = O. debilis var. corymbosa

       Oxalis sp.                                       [Rhopalosiphum maidis]

Key to apterae on Oxalis:-

1     BL 3.8-4.7 mm. SIPH pale, smooth and markedly swollen on distal 0.7 (Fig.34a). Dorsal hairs long, thick, and blunt or slightly expanded apically     …..Indomasonaphis anaphalidis

-      Without that combination of characters                                                                            …..2

2     Dorsum with an extensive solid dark sclerotic shield, with very conspicuous, dark,

       non-spinulose reticulation. SIPH slightly swollen near apex     …..Abstrusomyzus reticulatus

-      Dorsum with or without dark markings; if with a solid dark sclerotic dorsal shield then this either lacks reticulation, or the reticulation is either pale or finely spinulose, and SIPH are either markedly inflated over more than half of length or completely lack any trace of swelling                                                                                                                             …..3

3     SIPH cylindrical/tapering, with polygonal reticulation on distal 0.12-0.26 of length      …..4

-      SIPH if cylindrical/tapering then without polygonal reticulation

…..go to key to polyphagous aphids

4     ABD TERG 7 and 8 mostly with spinal tubercles (STu), and ABD TERG 2-5 mostly with marginal tubercles (MTu)                           …..Macrosiphum sp. (Oregon, BMNH collection)

-      Stu and MTu only sporadically present                                      …..Macrosiphum euphorbiae


Oxybaphus                                                   Nyctaginaceae

      Oxybaphus angustifolius = Mirabilis nyctaginea var. angustifolia

       O. nyctagineus                            Aphis asclepiadis, fabae; Macrosiphum euphorbiae

Use key to polyphagous aphids.


Oxycoccus see Vaccinium                                      Ericaceae


Oxydendrum                                                         Ericaceae

     Oxydendrum arboreum               Aulacorthum solani



Oxylobium                                                   Leguminosae

      Oxylobium callistachys               Aphis gossypii


Oxylobus                                                      Compositae

      Oxylobus sp.                                Aphis solitaria


Oxypetalum                                                 Apocynaceae

      Oxypetalum sp.                           Aphis gossypii, nerii

Use key to polyphagous aphids.


Oxypogon see Lathyrus                                                     Leguminosae


Oxyria                                                          Polygonaceae

      Oxyria digyna                              Aphis fabae; Indomasonaphis rumicis;

                                                            Nasonovia ribisnigri

Key to apterae on Oxyria:-

1     BL more than 3.5 mm. SIPH pale and strongly swollen on distal part                                    

…..Indomasonaphis rumicis*

-      BL less than 3 mm. SIPH pale or dark, and tapering or cylindrical on distal part            …..2

2     ANT tubercles well-developed. ANT PT/BASE 7.0-11.4. Thoracic spiracles much larger than abdominal ones, with apertures rounded                                            …..Nasonovia ribisnigri

-      ANT tubercles weakly developed. ANT PT/BASE 1.7-3.5. Thoracic spiracles similar in size to abdominal ones, with apertures reniform                                                     …..Aphis fabae


Oxytropis                                                     Leguminosae

      Oxytropis campestris                     Acyrthosiphon churchillense; Aphis astragali;

                                                              Nearctaphis vera

       O. deflexa  (incl. var. sericea)            Acyrthosiphon churchillense

       O. glabra                                       Megoura viciae (ssp. turanica Nevsky 1929)

       O. hudsonica = viscida var. hudsonica

      O. lambertii                                     Aphis ?craccivora (as medicaginis)

      O. microphylla                                Aphis craccivora

      O. myriophylla                                Aphis craccivora

      O. oxyphylla                                   Aphis craccae, oxytropis

      O. pilosa                                          Acyrthosiphon pisum

      O. sordida                                       Nearctaphis vera

      O. viscida var. hudsonica              Acyrthosiphon churchillense; Aphis masoni

      Oxytropis spp.                                Acyrthosiphon kondoi; Aphis oxytropiradicis, [polaris]

Key to apterae on Oxytropis:-

1     (Only al. known, but the following should also apply to apt.) Cauda as short as or shorter than its basal width in dorsal view. SIPH with transverse rows of  spinules. Longest hairs on ANT III 60-70 μm, c.2.5 Χ BD III                                                        …..Nearctaphis vera*

-      Cauda tongue- or finger-shaped, longer than its basal width. SIPH with normal imbrication. Longest hairs on ANT III 0.3-2.2 Χ BD III                                                                      …..2

2     ANT tubercles well developed, with smooth divergent inner faces. ABD TERG 1 and 7 without marginal tubercles (MTu). (SIPH without subapical reticulation)                       …..3

-      ANT tubercles undeveloped or weakly developed. ABD TERG 1 and 7 with MTu       …..6

3     SIPH black, black, swollen in middle (cigar-shaped), similar in length to cauda, which is also black                                                                                                           …..Megoura viciae

-      SIPH mainly pale, tapering/cylindrical, longer than cauda, which is also pale                 …..4

4     SIPH very attenuate distally, thinner than hind tibiae at their respective midlengths. ANT BASE VI 1.9-2.9 Χ R IV+V                                                             …..Acyrthosiphon pisum

-      SIPH gradually tapering, not attenuate distally, thicker than hind tibia at their respective midlengths. ANT BASE VI 1.1-1.8 Χ R IV+V                                                                …..5

5     ANT III with (2-) 4-11 rhinaria in a row on basal half. SIPH 1.2-1.6 Χ cauda

.....Acyrthosiphon churchillense

-      ANT III with 1 (-3) rhinaria near base. SIPH 1.6-2.1 Χ cauda          .....Acyrthosiphon kondoi

6     Dorsal abdomen without any sclerotisation. Large MTu consistently present on ABD TERG 2-4 as well as 1 and 7. R IV+V c. 1.5 Χ HT II                                …..Aphis oxytropiradicis*

-      Dorsal abdomen with at least some sclerotisation. MTu absent from ABD TERG 2-4 or only sporadically present, and small. R IV+V less than 1.4 Χ HT II                                        …..7

7     Hairs on ANT III 0.3-0.75 Χ BD III. Dorsal abdomen usually with a solid black shield extending over all of ABD TERG 1-6. SIPH 1.2-2.2 Χ cauda, which bears 4-9 hairs

..…Aphis craccivora

-      Hairs on ANT III 0.8-2.2 Χ BD III. Dorsal abdomen with scattered or segmentally-divided black markings, or with a variably developed or fragmented black shield that does not usually extend laterally to unite with marginal sclerites on ABD TERG 1-3. SIPH 0.5-1.1 Χ cauda, which bears 6-16 hairs                                                                                           …..8

8     R IV+V markedly narrowed subapically, with acute apex; 1.2-1.3 Χ HT II                           

…..Aphis oxytropis*

-      R IV+V tapering gradually to blunt apex; 0.8-1.1 Χ HT II                                               …..9

9     Dorsal abdomen with solid black shield extending over middle parts of ABD TERG 1-3 or 1-4 and completely across ABD TERG 4-6 or 5-6. ANT PT/BASE (1.7-)1.9-2.4

       …..Aphis craccae

 -     Dorsal abdominal sclerotisation variable but all tergites with at least some intersegmental division. ANT PT/BASE 1.3-1.9 (-2.0)                                                                           …..10

10   SIPH 0.50-0.65 (-0.67) Χ cauda                                                                     …..Aphis masoni

-      SIPH (0.65-) 0.70-1.1 Χ cauda                                                                                        …..11

11   Dorsal abdomen with spino-pleural bars on ABD TERG 4-6 or 5-6, but ABD TERG 1-2 (-3) only ever with scattered small sclerites (Fig.16i). Cauda tongue-shaped, 0.23-0.33 mm

…..Aphis astragali

-      Dorsal abdomen variably but more evenly sclerotised. Cauda elongate triangular, 0.16-0.21 mm                                                                                                                  …..Aphis polaris


Ozoroa                                                                                     Anacardiaceae

       Ozoroa insignis                             Aphis gossypii

       O. paniculosa                                Aphis gossypii


Ozothamnus                                                 Compositae

       Ozothamnus diosmifolius             Myzus persicae

       O. leptophyllus                              [?Casimira sp. (New Zealand; see Teulon et al. 2013)]





Pachira                                                        Malvaceae

       Pachira spp.                                  Aphis craccivora, gossypii; Protaphis middletonii

Use key to polyphagous aphids.


Pachylophis                                                 Onagraceae

      Pachylophis cespitosa                   Aphis oenotherae          


Pachycarpus                                                Apocynaceae

      Pachycarpus lineolatus                Aphis nerii

      P. schinzianus                               Aphis nerii


Pachypleurum                                             Apiaceae

      Pachypleurum alpinum             Cavariella nipponica


Pachystachys                                               Acanthaceae

      Pachystachys lutea                     Aphis aurantii, gossypii; Myzus persicae

Use key to polyphagous aphids.


Pachystima                                                  Celastraceae

      Pachystima myrsinites                Wahlgreniella sp. (western USA; A. Jensen,


Packera  see Senecio                                               Compositae

      P. anonyma see Senecio anonymus

      P. aurea see Senecio aureus

          P. cana see Senecio canus

        P. glabella see Senecio glabellus

        P. paupercula see Senecio pauperculus

        P. plattensis see Senecio plattensis

          P. tomentosa see Senecio tomentosus


Padus see Prunus                                                                 Rosaceae

     Padus avium see Prunus padus


Paederia                                                      Rubiaceae

      Paederia chinensis = P. foetida

      P. foetida (incl. chinensis,              Aphis gossypii, spiraecola;

                        mairei, maritima,            Aulacorthum esakii, [myriopteroni];

                        scandens, tomentosa)         Pseudomegoura nipponica

        P. scandens = P. foetida

        P. tomentosa = P. foetida

Key to apterae on Paederia:-

1      Head dark and densely spiculose at least on ventral surface, with ANT tubercles

        well-developed and steep-sided                                                                                       …..2

-       Without that combination of characters                         …..go to key to polyphagous aphids

2      Tergum wholly dark sclerotic. SIPH cylindrical/tapering on distal half, mainly pale/dusky, sometimes darker at base and apex. Longest hairs on ANT III more than 0.5 Χ BD III

…..Aulacorthum esakii

-       Tergum not wholly sclerotic, often with variably developed dark sclerites on ABD TERG 1-6. SIPH somewhat swollen on distal half, and wholly dark. Longest hairs on ANT III less than 0.5 Χ BD III                                                                     …..Pseudomegoura nipponica


Paeonia                                                       Paeoniaceae

      Paeonia lactiflora                         Myzus persicae

        P. Χsuffruticosa                            Aphis gossypii, spiraecola

Use key to polyphagous aphids.


Palaquium                                                              Sapotaceae

      Palaquium sp.                              Parathoracaphis setigera


Palicourea                                                   Rubiaceae

      Palicourea alpina                         Aphis (Toxoptera) aurantii; Aulacorthum solani

Use key to polyphagous aphids.


Palisota                                                       Commelinaceae

      Palisota ambigua                          Pentalonia nigronervosa

      P. hirsuta                                      Pentalonia nigronervosa

        P. thyrsiflora = P. ambigua


Paliurus                                                       Rhamnaceae

        Paliurus spina-cristi                      Aphis frangulae, gossypii, [paliuri Lichtenstein (nomen

                                                                   nudum)], nasturtii, Aphis sp. (Toros et al., 2002: 31)

        Paliurus sp.                                   [Aphis exploratus (= nasturtii?)]

Use key to aphids on Rhamnus.



Pallenis                                                       Compositae

      Pallenis maritima                         Brachycaudus helichrysi; Protaphis terricola

        P. spinosa = Asteriscus spinosus    

Use key to apterae on Asteriscus.


Palura  see Symplocos                                             Symplocaceae

        Palura chinensis = Symplocos paniculata


Panax                                                                                        Araliaceae

        Panax spp.                                    Aphis aurantii, craccivora, odinae; Myzus persicae;

                                                              [Rhopalosiphoninus latysiphon]

Use key to polyphagous aphids.

Pandanus                                                                               Pandanaceae

       Pandanus tectorius                       Astegopteryx pandani


Pandiaka                                                     Amaranthaceae         

        Pandiaka involucrata                   Aphis gossypii


Pandorea                                                     Bignoniaceae

      Pandorea pandorana                   Myzus ornatus

      P. ricasoliana                                Aphis gossypii

Use key to polyphagous aphids.


Panicularia see Glyceria                                                     Poaceae                        


Panicum                                                      Poaceae                        

        Panicum adenophorum               Sitobion neusi, [Sitobion sp. (Millar 1994)]

        P. afzelii