Sepedon americana Steyskal, 1951

Elberg, Kaupo, Rozkošný, Rudolf & Knutson, Lloyd, 2009, A review of of the Holarctic Sepedon fuscipennis and S. spinipes groups with description of a new species (Diptera: Sciomyzidae), Zootaxa 2288, pp. 51-60 : 57-58

Sepedon americana Steyskal, 1951 , stat. nov.

( Figs 20–23 )

Sepedon spinipes americana Steyskal, 1951

Diagnosis. Cerci usually not reaching beyond lower margin of epandrium; surstylus not longer than distiphallus in lateral view ( Fig. 20 ); distal emargination of basal part of hypandrium only shallow ( Fig. 21 ); distiphallus conspicously long, markedly dilated apically ( Fig. 22 ).

Distribution. S. americana occurs over a large area in Alaska, Canada, and northernmost United States.

Material examined. UNITED STATES: Michigan, Livingston Co., Rushton, 19.v.1946, 2 3, 1 Ƥ, G. C. Steyskal; Alaska, Nenana, 16.vi.1951, 1 3, R.I. Sailor; New York, Chautauqua Co, S. Dayton, marsh area, 1.vi.1963, 1 3, W. W.Wirth (all USNM).

Figures

FIGURES 20 – 27. Species of Sepedon spinipes group, male terminalia. 20 – 23. S. americana. 24 – 27. S. spinipes. 20, 24. Lateral view. 21, 25. Hypandrium in lateral view. 22, 26. Aedeagus in lateral view. 23, 27. Epiphallus in caudal view. Scales: 0.5 mm (Figs 20, 24), 0.3 mm (Figs 21 – 23, 24 – 27).