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Wax-banded clematis aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Adult apterae of Aphis clematidis are dark olive green, with a blackish spinal stripe. On both sides of this stripe, there is a series of transverse oval white wax patches, and also a row of spots along the sides of the abdomen. These spots sometimes merge to give a series of white wax transverse bars (cf. Aphis vitalbae in Europe & Aphis clematiphaga in east Siberia, which are unwaxed). The siphunculi, cauda and legs are mostly pale yellow, apart from dark tips to siphunculi, tarsi and cauda. Pigmentation is variable. Smaller, paler specimens may occur in midsummer. Hairs on antennal segment III are pointed, 0.8-1.5 times the basal diameter of that segment (cf. Aphis clematicola in east Siberia, which has the hairs on antennal segment III short and blunt, 0.5-0.7 that basal diameter). The apical rostral segment (RIV+V) is 0.75-1.0 times the second hind tarsal segment (HTII) (cf. Aphis longituba on clematis in S. & E. Asia & Aphis vitalbae in Europe, both of which have RIV+V 1.1-1.7 times the length of HTII). The siphunculi are longer than the cauda. The body length of adult Aphis clematidis apterae is 1.7-2.3 mm.
Image by permission, copyright Vidak Lakušić, all rights reserved.
The alate Aphis clematidis has the head and thorax black, and the abdomen black-green with white wax markings. Alatae have 5-9 secondary rhinaria on antennal segment III. The siphunculi are dark brown.
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Aphis clematidis lives on the young shoots, flower stems and leaves of Clematis species. These aphids are monoecious holocyclic, with sexuales appearing in autumn. They are often attended by ants. Aphis clematidis is currently found in central and southern Europe although, with global warming, an expansion of range is likely.
Other aphids on the same host
Aphis clematidis has been recorded from 13 Clematis species (Clematis alpina ssp. sibirica, Clematis buchananiana, Clematis cirrhosa, Clematis flammula, Clematis forsteri, Clematis hexapetala, Clematis hirsutissima, Clematis integrifolia, Clematis orientalis, Clematis paniculata, Clematis recta, Clematis vitalba, Clematis viticella).
Blackman & Eastop list 23 species of aphid as feeding on clematis (Clematis) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 9 as occurring in Britain (Show British list).