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Idaho painted maple aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
All adult viviparae of Drepanaphis idahoensis are winged. The body is entirely frosted with white wax except for a dark, U-shaped line more-or-less connecting the dorsal abdominal tubercles on tergites III to the siphunculi (cf. Drepanaphis granovskyi, which has very little wax on the body). Their antennae are unusually long - around twice the body length. Antennal segment I is dark, but the others are pale apart from dark smudges at the distal tips of segments III-V, and the base of VI. Antennal segment III bears 4-10 secondary rhinaria, and the terminal process is about 9.5 times as long as base of segment VI (cf. Drepanaphis utahensis and Drepanaphis granovskyi, which have the terminal process 6.0-7.0 and 5.0-6.0 times the base of VI, respectively). The rostrum almost reaches the middle coxae.
The thorax is dark, and the legs are pale, except for the femur-tibia joint which is dusky (cf. Drepanaphis knowltoni, whose fore-femora are entirely dark). The U-shaped area of the stigma, base of the radius, and distal ends of veins are dusky. The abdomen has a few small, dorsal scleroites. There are marginal sclerites on tergites I-V. These are pale on I and II, but dark on III-V. The dorsal abdominal tubercles on tergite III are prominent, and broadly-joined for over half their length. The tubercles on tergite II are short, about one third the length of III, but at least twice as long those on I and IV which are usually inconspicuous. All dorsal abdominal tubercles are dark, bearing blunt to slightly capitate hairs. The siphunculi are dark with a pale distal end. The adult Drepanaphis idahoensis body length is 1.4-2.0 mm.
Sexuales develop in autumn. The alate male (see first picture below) is more thinly waxed than the alate vivivipara. It has broad black bands on each abdominal tergite, and dark siphunculi with pale distal ends. The ovipara (see second picture below) is mottled dark brown, and has the end of her abdomen extended like an ovipositor.
Drepanaphis idahoensis is monoecious holocyclic on one species of maple, the bigtooth maple (Acer grandidentatum). Alate males and oviparae are produced in autumn. The aphid is found in western states of the USA.
Other aphids on the same host
Drepanaphis idahoensis has only been recorded on 1 maple species (Acer grandidentatum).
Blackman & Eastop list 7 species of aphid as feeding on bigtooth maple (Acer grandidendatum) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 2 as occurring in Britain (Show British list).