Somatiosoma setipygum, Ebejer, 2009

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 : 379-380

Somatiosoma setipygum sp. n.

Figs 29 , 30

Etymology: From Latin seta (seta) and pyga (buttocks), and refers to the setulose hypoproct in the female and the long setae on the male epandrium.

Diagnosis: Entirely yellow species in both sexes, easily recognized in male because of long setae on ep; apical segments of female abdomen also have setae that are longer than usual, but a distinctive feature is the hypr, which has numerous setulae that can be seen without dissection. These are similar in size and density to setulae on cerc.

Description:

Male.

Head: Yellow, oc triangle black; fr not visible in profile, at anterior oc 0.3 width of head, narrowed anteriorly, at level of antenae 0.7 width of that at anterior oc; face very short and depressed and with no distinct carina in upper half; gena receding, 0.25 height of eye at middle and with several minute pale setulae; ocp in profile broadly visible behind eye margin, slightly convex; mouthparts yellow, palp short oval about half length of proboscis; antenna all yellow except third segment of arista which is brown; third antennal segment round, about 1.4× height of gena at middle and about 0.35 diameter of eye, second segment with dorsal seta; 3 orb, the anterior inclinate, 1 vte and 1 vti, oc strongly divergent and long, pvt long and crossed, about 10 minute pale yellow setulae scattered on fr and between orb, postocular setulae in 1 row and postgenal seta long.

Thorax: Entirely pale yellow with most setae also pale yellow including those on pleura. Chaetotaxy: 1 pprn with 3–5 setulae around it, 1 strong dc and another about half its length just in front of it, acrs undifferentiated from scutal setulae except short prscut pair, setulae in 8–10 irregular rows at level of transverse scutal suture; 1 posthu, 1 short sa and 1 strong pa, scut with 2 pairs of marginals, subapical pair longer, disc of scut with 14 scattered setulae, anepisternum with 1 seta at middle of posterior margin and a short seta above it; katepisternum with 1 seta at upper margin, each with several pale setulae in front, more numerous on anepisternum.

Wing: Hyaline with pale yellow veins, costa with minute dark spine-like setulae from R 1 to R 2+3, distance on costa between R 2+3 and R 4+5 about 0.6 that between R 4+5 and M 1+2, apical section of Cu about 2.2× length of posterior crossvein. Haltere yellow.

Legs: All yellow, only fore femur a little dilated, all setae and setulae pale yellow, longest on posterior aspect of fore femur, claws black, short, about half length of tarsomere 5, apicoventral seta on mid tibia yellow and distinctly shorter than diameter of tibia at apex.

Abdomen: Entirely yellow with a few short and fine pale yellow setulae on each tg.

Postabdomen: All yellow with small hypopygium and three distinctive long setae on each side of ep, prg simple, digitate and fine setulose on outer aspect.

Female.

As male, but tending to have pale brown setae and setulae. Postabdomen: st 8 almost translucent and with distinct setae; hypr membranous and small, but with setulae as dense and as long as those on cerc; s small and black; duct membraneous.

Length: ơ body 2 mm, wing 1.8 mm; ^body 1.9 mm, wing 1.7 mm.

Holotype: ơ NAMIBIA: Brandberg , Mason Shelter, 21°04'42"S: 14°35'33"E, 5–14.iii.2002, alt. 1750 m, A.H. Kirk-Spriggs, light trap ( NMNW).

Paratypes: 1ơ 2^same data ( NMNW) .

Figures

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. 30. Somatiosoma setipygum sp. n., ^postabdomen, ventral (a) and lateral (b). Scale bar = 0.2 mm.