Genus Eumerus Meigen, 1822

The Iranian species of the Eumerus tricolor species group

A total of 17 species belonging to the Eumerus tricolor group are recorded from Iran, six of which are new to science, i.e., Eumerus atricolorus Gilasian & van Steenis sp. nov., E. brevipilosus Gilasian & van Steenis sp. nov., E. chekabicus Gilasian & van Steenis sp. nov., E. ovoformus Gilasian & van Steenis sp. nov., E. pilosipedes Gilasian & van Steenis sp. nov. and E. vallicolus Gilasian & van Steenis sp. nov., and three species are newly reported from Iran, i.e., E. hissaricus Stackelberg, 1949, E. longitarsis Peck, 1979 and E. richteri Stackelberg, 1960 .

Diagnosis of the Eumerus tricolor species group

The Eumerus tricolor species group can be identified by the combination of the following characters: basoflagellomere radially furrowed, apico-laterally with clearly demarcated, ellipsoidal fossa (Fig. 11 AI); katepisternum ventrally, medially and dorsally pilose (as in character states 44A:0 and 44B0:1 and related figures in van Steenis & Wyatt 2020); wing vein costa with a row of long posterodorsal setae basally (Fig. 8F); terga often more or less red coloured; anterior surstylus lobe undeveloped (Figs 18 AF, 19A–E).