Eumerus Meigen, 1822

Gilasian, Ebrahim, Steenis, Jeroen van & Parchami-Araghi, Mehrdad, 2020, Review of the Eumerus tricolor species group (Diptera: Syrphidae) in Iran, with description of six new species, European Journal of Taxonomy 722, pp. 106-152 : 111

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).

Figures

Fig. 11. Basoflagellomere, mediolateral view. A. Eumerus atricolorus Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). B. E. brevipilosus Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). C. E. brevipilosus Gilasian & van Steenis sp. nov., paratype, ♀ (HMIM). D. E. chekabicus Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). E. E. kazanovzkyae Paramonov, 1927, ♂, Paveh, Iran (HMIM). F. E. hissaricus Stackelberg, 1949, ♂, Ghoochan, Iran (HMIM). G. E. ovoformus Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). H. E. pilosipedes Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). I. E. vallicolus Gilasian & van Steenis sp. nov., holotype, ♂ (HMIM). Scale bars = 0.5 mm. Abbreviations: a = length of basoflagellomere; b = width of basoflagellomere.

Fig. 8. A–E. Adult habitus, lateral view. F. Basicosta. A–D. Female. E–F. Male. A. Eumerus brevipilosus Gilasian & van Steenis sp. nov., paratype (HMIM). B. E. coeruleus (Becker, 1913), Ghoochan, Iran (HMIM). C. E. longitarsis Peck, 1979, Mian Jangal, Iran (JSA). D. E. persarum Stackelberg, 1961, Bazman, Iran (JSA). E. E. tricolor (Fabricius, 1798), Paleochori, Greece (JSA). F. E. tadzhikorum Stackelberg, 1949, Chekab Valley, Iran (JSA). Scale bars = 1.0 mm. Abbreviations: ac = anterodorsal costal setae; pc = posterodorsal costal setae.

Fig. 18. Epandrium, cercus and surstylus, lateral view. A. Eumerus atricolorus Gilasian & van Steenis sp. nov., holotype (HMIM). B. E. brevipilosus Gilasian & van Steenis sp. nov., holotype (HMIM). C. E. chekabicus Gilasian & van Steenis sp. nov., holotype (HMIM). D. E. coeruleus (Becker, 1913), Chekab Valley, Iran (HMIM). E. E. ovoformus Gilasian & van Steenis sp. nov., holotype (HMIM). F. E. richteri Stackelberg, 1960, Lar, Iran (HMIM). Scale bars = 0.1 mm.