Somatiosoma, : Frey, 1958

Ebejer, Martin J., 2009, A revision of Afrotropical Chyromyidae (excluding Gymnochiromyia Hendel) (Diptera: Schizophora), with the recognition of two subfamilies and the description of new genera, African Invertebrates 50 (2), pp. 321-321 : 370

Key to the Afrotropical species of Somatiosoma

[Note: awashensis is only known from the male; hirtiscutellatum and an undescribed species from Madagascar are only known from females.]

Males

1 Scutellum with a pair of minute, covergent or crossed, strictly apical setulae, postabdomen Figs 28a–d ....................................................................... nitescens Frey

– Scutellum without minute apical setulae .............................................................. 2

2 Pregonite visible externally as a very long process lying along ventral margin of ep and having a number of setae at its apex .............................................................. 3

– Pregonite of different shape, often not visible at all without dissection ............... 4

3 Pregonite ending in a fan of at least 5 setae; gena not strongly receding in profile; antennal segment 3 about 1/4 diameter of eye, Fig. 25a ........................................ ...................................... eremicolum Ebejer (see Ebejer 2008 a: 692, figs 17, 18)

– prg ending in only 2 setae; gena strongly receding in profile; antennal segment 3 about 1/2 diameter of eye, Fig. 26a , postabdomen Fig. 26b .... grandicornis sp. n.

4 Sternite 6 with long posteriorly directed lobes forming a U-shape, visible without dissection; ep with long setulae and near ventral margin with very long setae, postabdomen Fig. 29 .......................................................................... setipygum sp. n.

– Sternite 6 with no special modifications ............................................................... 5

5 Antennal segment 3 about 1/3 diameter of eye; gena receeding in profile; prg larger and Y-shaped often partly visible externally, postabdomen Fig. 27a ..................... ................................................................................................ messumensis sp. n.

– Antennal segment 3 about 1/4 diameter of eye; gena not significantly receding in profile; prg small, narrow, not visible externally, postabdomen Fig. 24 ................ ................................................................................................... awashensis sp. n.

Figures

Fig. 28. Somatiosoma nitescens Frey:(a) ơ: hypopygium, lateral; (b) prg, ventral; (c, d) part of ơ postabdomen, lateral (c) and dorsal (d); (e–g) ^postabdomen: (e) dorsal, (f) ventral, (g) spermatheca, enlarged. Scale bars = 0.15 mm.

Fig. 25. Somatiosoma eremicolum Ebejer: (a) ơ head, lateral, scale bar = 0.3 mm; (b–d)^postabdomen: (b) dorsal, (c) ventral, (d) lateral, scale bars = 0.15 mm.

Fig. 26. Somatiosoma grandicornis sp. n.: (a) ơ head, lateral; (b) ơ hypopygium, lateral, with prg shown also in ventral view; (c, d) ^postabdomen, ventral (c) and lateral (d). Scale bar = 0.35 mm in Fig. 26a and 0.2 mm in Figs 26b–d.

Fig. 29. Somatiosoma setipygum sp. n., ơ: (a) hypopygium, lateral; (b) prg, ventral; (c) distiph, lateral, scale bars = 0.15 mm; (d) st 6, ventral, scale bar = 0.2 mm.

Fig. 27. Somatiosoma messumensis sp. n., (a) ơ hypopygium, lateral, with prg shown also in ventral view, scale bar = 0.15 mm; (b, c) ^postabdomen, lateral (b) and ventral (c), scale bar = 0.2 mm.

Fig. 24. Somatiosoma awashensis sp. n., ơ hypopygium, lateral, with prg shown also in ventral view. Scale bar = 0.15 mm.