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Syrphidae
Rohdendorfia dimorpha Smirnov
Nomenclature
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Tribe: BacchiniGenus: Rohdendorfia
SUMMARY
Genus Rohdendorfia Smirnov, 1924 comprises a small group of species confined to the Old World. The species have great similarity to species of the genera Platycheirus Le Peletier & Serville, 1828 and Melanostoma Schiner, 1860. They differ, however, in a coarsely punctured frons, scutum and scutellum, the central part of occiput is very broad, and the ocellar triangle more removed from the occiput. The profile of face is rather “nosy”, and the face widening downwards in the male. Abdomen is rather short, broad and flat, with large yellowish markings (Barkalov and Nielsen 2010).
Using the identification key of Barkalov and Nielsen (2010), R. dimorpha can be distinguished from other species by having protibia and protarsus without long pili ventrally and metafemur without long erect piliantero-ventrally. Females of R. dimorpha are very similar to females of Rohdendorfia montivaga, both with face with two longitudinal vitta of grey dusting (from frons to mouth edge), black maculae or vitta on posterior margins of abdominal terga broadened towards the lateral margins. They differ by the distribution: R. dimorpha is known from Pamir and Alaj regions.