Dolichopus fraterculus Zetterstedt, 1843

Kahanpää, Jere, 2008, Nematode-induced demasculinisation of Dolichopus males (Diptera: Dolichopodidae), Zootaxa 1689, pp. 51-62 : 57

Dolichopus fraterculus Zetterstedt, 1843

Dolichopus fraterculus Zetterstedt, 1843: 510

Dolichopus micropygus Wahlberg, 1850: 216 syn. nov. Dolichopus brachyurus Zetterstedt, 1859: 5015 syn. nov.

Demasculinised males examined: Coll. JK — Finland, 2ɗ Obb: Tervola, Yrttijänäk (7346833:3407825), 28.vi.–2.viii.2004, J. Salmela & J. Ilmonen; 1ɗ Obb: Tervola, Ruuttulampi 2 (7347464: 3409770), 28.vi.– 2.viii.2004, J. Salmela & J. Ilmonen; 1ɗ Obb: Tervola, Karhakkamaanjänkä (7346254: 415785), 28.vi.– 2.viii.2004, J. Salmela & J. Ilmonen.

Dolichopus micropygus was described from one male collected from northern Sweden. It has not been reported from other countries to date ( Negrobov 1991, Pollet 2006). D. micropygus differs from D. fraterculus by the small hypopygium, simple legs, broad face and a punctiform or absent pterostigma ( Wahlberg 1850). Ringdahl (1949) classified D. micropygus as a gynandromorphic form of D. fraterculus . Grichanov (2002) has also expressed doubt about the validity of this species. Parent (1938), Negrobov (1991) and Yang et al. (2006) treated D. micropygus a valid species. Three of the four males examined were parasitised; the fourth has an exit scar in the pleural membrane. D. micropygus Wahlberg is here synonymised with D. fraterculus Zetterstedt, 1843 .

Dolichopus brachyurus was described by Zetterstedt from a male from Swedish Lapland (Lapponia). It has not been found elsewhere. According to Zetterstedt (1859), the male genitalia of D. brachyurus are small with unusually small cerci, and the pterostigma is absent (stigmate nullo) as in D. consimis and D. cruralis . Parent (1938) treated D. brachyurus as a valid species. Ringdahl (1949) was unable to find the type specimen of D. brachyurus . The holotype has since been found in the Zoological Museum, University of Lund and D. brachyurus was synonymised with D. micropygus ( Grichanov 2002, Grichanov 2006b). Since D. micropygus is here found to be a junior synonym of D. fraterculus , D. brachyurus Zetterstedt, 1859 must also synonymised with D. fraterculus Staeger, 1842 .