The Arganthomyza vittipennis group

This group is established here for the single Nearctic species, A. vittipennis (Walker, 1857) . It can be diagnosed by (1) the reduced silvery spots between the frontal triangle and posterior part of the orbits, (2) the lack of ac microsetae, (3) the brown longitudinal wing pattern, (4) the pregonite projecting ventrally and with a single group of setae, (5) the basal membrane with a group of dense digitiform excrescences, (6) the dark, strongly sclerotized connecting sclerite and (7) the mushroom-shaped spermathecae. Following the phylogenetic hypothesis of ROHÁĆEK & TÓTHOVÁ 2014 (as Ischnomyia spinosa) and morphological analysis of mainly male genitalic and female postabdominal characters, the group represents a separate clade of Arganthomyza (for more detail see discussion below).