InfluentialPoints.comBiology, images, analysis, design...
| Aphids | Find them | How to ID | AphidBlog |
| InfluentialPoints.com Biology, images, analysis, design... |
|
"It has long been an axiom of mine that the little things are infinitely the most important" |
|
|
Macrosiphoniella frigidivoraGreen sagebrush aphidOn this page: Identification & Distribution Other aphids on the same hostIdentification & DistributionAdult apterae of Macrosiphoniella frigidivora (see two pictures below) are spindle-shaped, green or pinkish green, dusted with fine gray wax powder, with dark siphunculi, and a dusky cauda. The legs are mainly dark, apart from the bases of the femora and middle of tibiae, which are dusky. The antennae are dark apart from the base of segment III. Antennal tubercles are moderate to low. Antennae are 0.80-1.30 times as long as the body, with the terminal process about 2.5-4.0 times (Iran specimens 2.1-2.9 times) the base of antennal segment VI. The longest hair on segment III is about twice as long as the basal diameter of that segment. The apical rostral segment is stiletto-shaped, and is 1.0-1.15 times the second hind tarsal segment (cf. Macrosiphoniella artemisiae, which has that segment 0.85-1.1 times the second hind tarsal segment). The dorsum is mostly membranous, and dorsal hairs are stout and blunt. First tarsal segments have 3:3:3 hairs (fore:mid:hind). Siphunculi are more or less cylindrical, moderately tapering, and broadest at the base without a distinct basal constriction (Macrosiphoniella artemisiae, which has siphunculi with a slight basal constriction). The siphunculi are about 0.13-0.19 times body length, and 0.80-1.05 times the cauda. The cauda is elongate, constricted at the basal third, acuminate (=pointed) at the apex, and with 12-22 hairs. The body length of adult Macrosiphoniella frigidivora apterae is 1.6-2.8 mm. Note: Macrosiphoniella frigidivora appears to be closely related to the North American species Macrosiphoniella frigidicola. The latter species is less intensively pigmented, has shorter dorsal hairs and has fewer caudal hairs.
Images above copyright Sedighi et al. (2020) under a Creative Commons licence. The alate Macrosiphoniella frigidivora has a dark brown head & thorax and green abdomen as in the apterous females, but with distinctly pigmented antesiphuncular and marginal sclerites. Antennae are slightly longer than the body, with the terminal process about 3.2-3.4 times as long as the base of antennal segment VI. There are 17-21 secondary rhinaria on antennal segment III. Macrosiphoniella frigidivora feeds at the ends of shoots of Artemisia. It was first described from Artemisia frigida, and has since also been found on Artemisia rupestris and Artemisia turanica in Iran. Macrosiphoniella frigidivora appears to be widely distributed in Asia (Mongolia, Kazakhstan, Iran), possibly extending to Japan (as Macrosiphoniella hokkaidensis). Other aphids on the same hostMacrosiphoniella frigidivora has been recorded on 3 Artemisia species (Artemisia frigida, Artemisia rupestris, Artemisia turanica). Blackman & Eastop list 20 species of aphid as feeding on Fringed sagebrush, Arctic sage (Artemisia frigida) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 0 as occurring in Britain (Show British list).
|
