Six new species of the genus Eumerus Meigen, 1822 from Iran (Diptera, Syrphidae)

Six new species of the genus Eumerus Meigen, 1822 are here described from Iran. The new species and their four related groups are as follows: E. nadoosheni Gilasian & van Steenis sp. nov. of the Eumerus barbarus group; E. pollinipedes Gilasian & van Steenis sp. nov. of the Eumerus minotaurus group; E. effossus Gilasian & van Steenis sp. nov. and E. similis Gilasian & van Steenis sp. nov. of the Eumerus obliquus group, as well as E. intermedius Gilasian & van Steenis sp. nov. and E. khiabani Gilasian & van Steenis sp. nov. of the Eumerus ornatus group. In addition, the species E. argyropus Loew, 1848 and E. torsicus Grković & Vujić, 2015 are newly recorded from Iran. The illustrations of the male genitalia and images of the new species are provided