The Anthomyza macra group

The Anthomyza macra group comprises species with the most plesiomorphic formation of the male and female genitalia (cf. simple apex of nlum, small spines in saccus, presence of setae on medandrium (see Fig. 240), separate female S7, simple internal sclerites in the female genital chamber and curved (not twisted) apex of ventral receptacle) and therefore is considered to be the sister group to all remaining Anthomyza species (cf. ROHÁĆEK 2009 a, ROHÁĆEK et al. 2009). On the other hand, the group is also distinguished by several apomorphies: (1) very broad epandrium; (2) distally dilated gonostylus; (3) saccus of distiphallus with internal coiled strip-like sclerite; (4) very elongate spermathecae. Three Palaearctic species, viz. A. macra Czerny, 1928, A. pleuralis Czerny, 1928 and A. decolorata Roháček, 2009, and three Nearctic species, viz. A. tenuis (Loew, 1863), A. oblonga sp. nov. and A. silvatica sp. nov. are currently assigned to the group. Because of their very similar habitus and male and female genitalia, the identincation of some of these species can be difncult. This also causes problems in recognizing interrelationships of all its members, but hypotheses of the afnnities of the Nearctic species are presented in the discussions of each species below.