Sepedon fuscipennis

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 : 59

Key to species of the Sepedon fuscipennis and S. spinipes groups

(partly based on keys by Steyskal 1951, Orth 1986, and Knutson & Orth 2001)

1 Posterior crossvein long and oblique and at least slightly S-shaped ( Fig. 28 ), katatergite bare ( S. fuscipennis group) ...................................................................................................................................................................................... 2

- Posterior crossvein short, less oblique and regularly bowed outwardly ( Fig. 29 ), posterior part of katatergite with blackish hairs ( S. spinipes group) ................................................................................................................................. 6

2 Pedicel index (see p. 2) about 2.5 ................................................................................................................................ 3

- Pedicel index at least 4.0 or more ( Fig. 2 ) .................................................................................................................. 4

3 Hind tibia with straw coloured area in distal half, contrasting with dark brown before and after, male hind tibia with short hairs on dorsal surface, male terminalia in Figs 8, 12, 16 .................................................. S . floridensis Steyskal

- Hind tibia without contrasting area, more or less uniformly brown, male hind tibia with hairs as long as width of tibia on dorsal surface, male terminalia in Figs 9, 13, 17 .............................................................. S . fuscipennis Loew

4 Orbital spot elongate subtriangular in dorsal view ( Fig. 1 ), male terminalia in Figs 4–7 , basal part of hypandrium markedly prominent in lateral view ( Fig. 5 ) ..................................................................................... S. hecate sp. nov.

- Orbital spot short, drop-like in dorsal view, face deeply concave in lateral view, basa part of hypandrium not prom- inent in lateral view ( Figs 9, 11 ) .................................................................................................................................. 5

5 Pedicel index about 4.0, male terminalia in Figs 9, 13, 17 .......................................................... S . gracilicornis Orth

- Pedicel index about 5.0, male terminalia in Figs. 11, 15, 19 ..................................................... S . tenuicornis Cresson

6 Aedeagus unusually long, dilated apically ( Fig. 22 ), male terminalia in Figs 20–23 S. americana Steyskal stat. nov.

- Aedeagus short, not dilated apically ( Fig. 26 ), male terminalia in Figs 24–27 ............................ S . spinipes (Scopoli)

Figures

FIGURES 28 – 29. Wings of Sepedon species. 28. S. hecate sp. nov. 29. S. spinipes.

FIGURES 1 – 3. Sepedon hecate sp. nov., male. 1. Head in dorsal view. 2. Head in lateral view. 3. Left hind leg in lateral view. Scales: 1.0 mm.

FIGURES 8 – 19. Nearctic species of Sepedon fuscipennis group, details of male terminalia. 8, 12, 16. S. floridensis. 9, 13, 17. S. fuscipennis. 10, 14, 18. S. gracilicornis. 11, 15, 19. S. tenuicornis. 8 – 11. Hypandrium in lateral view. 12 – 15. Aedeagus in lateral view. 16 – 19. Epiphallus in caudal view. Scale: 0.3 mm.

FIGURES 4 – 7. Sepedon hecate sp. nov., male terminalia. 4. Lateral view. 5. Hypandrium in lateral view. 6. Aedeagal complex in lateral view. 7. Epiphallus in caudal view. Scales: 0.3 mm. aa aedeagal apodeme, ae aedeagus, ce cercus, dph distiphallus, ea ejaculatory apodeme, ep epandrium, eph epiphallus, hy hypandrium, po postgonite, pr pregonite, ss surstylus.

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).