Genus Cheilosia (Diptera, Syrphidae) with more than 300 Palaearctic species is the most speciose group of hoverflies in Europe. One of the most widespread taxa with unclear taxonomic status is Cheilosia vernalis (Fallen, 1817). This species shows great morphological variation in external morphological characters. A subdivision of the taxon has been suggested, but the male terminalia of the diff...
