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Syrphidae
Microdon (Omegasyrphus) biluminiferus Hull
Nomenclature
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Genus: MicrodonSubgenus: Microdon (Omegasyrphus)
Species:
Microdon (Omegasyrphus) biluminiferus Hull
SUMMARY
Omegasyrphus was established for some small Microdon species with a distinctive abdominal shape: 2nd segment is widened, flattened, flared, with its lateral margin subcircular, thickened and rounded; and the rest of abdomen (3rd–5th segments) narrowed and cylindrical (Hull 1949: 309).
Omegasyrphus species have first two abdominal segments with three distinct depressions, two lateral ones and an anterior medial one; abdomen more or less parallel-sided; scutellum with apical calcar; vein R4+5 with an appendix extending posteriorly into cell R4+5; vein M1 rounded, not angulate, without a appendix; face convex, without mystax; metatibia without long pile along dorsal edge, forming a distinct brush.