''Sphegina (Asiosphegina) achaeta'' is a species of hoverfly in the family Syrphidae found in

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John C. Wells, Joh ...

. It's easily identified by the weak setae on abdominal tergite I. It's similar in appearance to '' S. adusta'' but easily differentiated upon closer examination. The male genitalia are similar to '' S. pollex'' and '' S. culex'', though it can be distinguished by having an acute posterodorsal corner of the superior lobe and a broader surstylus; it differs further from ''S. pollex'' by lacking a sub-basal dorsal thumb-like lobe. The arrangement of bristles on tergite I is similar to '' S. japonica''.

Etymology

The name comes from the Greek words 'a', meaning 'without', and 'chaite', meaning 'long hair', referring to the lack of strong setae laterally on tergite I.

Description

In male specimens, the body length is 6.1 to 7.2 millimeters and the wing length is 5.5 to 6.3 millimeters. The face is concave with a strongly developed frontal prominence. The occiput is black; gena and mouth edge dark brown with large subtriangular non-pollinose shiny area; antenna dark brown with black setae dorsally on scape and pedicel; thorax dark brown to black; postpronotum red-brown; scutellum black and semi-circular; pro- and mesoleg with femora and tibiae dark brown to black on apical ⅔ to ¾; pro- and meso- tarsi with

tarsomeres The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments (called podomeres) are of Latin origin, and may be confused with terms for bones: ''coxa'' (meaning hip, plur ...

2–5 black; metaleg with dark brown coxa, yellow trochanter; dark brown metafemur with basal ¼ yellow, incrassate; metatibia black and yellow biannulate, without apicoventral dens; metatarsus entirely black with a thin basal tarsomere. The basal flagellomere is short and oval and the

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is pilose, slightly more than 2.5 times as long as the basal flagellomere. No female specimens are known.

References

Brachyopini Insects described in 2015 Diptera of Asia {{Brachyopini-stub