Gymnochiromyia turneri, Ebejer, 2008

Ebejer, M. J., 2008, New species of Gymnochiromyia Hendel, 1933 (Diptera: Schizophora: Chyromyidae) from Southern Africa, African Invertebrates 49 (1), pp. 77-77 : 106-107

Gymnochiromyia turneri sp. n.

Fig. 26

Etymology: Named after R.E. Turner who collected this species and many other specimens of Chyromyidae in South Africa.

Diagnosis: A small species with pale brown msn stripes anteriorly and a presutural dc. The tergites and sternites are predominantly dark brown; the tergal setulae are long.

Description:

Male.

Head: Yellow. Gena in profile, below middle of eye, about equal to height of eye; yellow and with pale setulae. ocp in profile barely visible behind eye, with short postocular setulae in one irregular row; isolated lower post-genal seta short and pale yellow. Mouthparts small, palp narrow, all yellow; setulae on oral margin short. Face poorly sclerotised and depressed. Antenna yellow, second segment with strong dark dorsal seta, third segment brown, arista black except for yellow first two segments.

Thorax: msn yellow with pale brown stripes anteriorly; pleura and mtn yellow, only stpl with triangular pale brown mark. Chaetotaxy: 1 hu, 1 psthu, 2 ntpl, 1 sa, 1 pa, 1+3 dc, acrs short in 6 irregular rows, one prescutellar pair longer; 1 mspl and 1 stpl.

Wing: Hyaline, veins all pale yellow, distance on costal margin between R to R 4+5 is 0.6 that between R and M; distance between crossveins about equal to length of apical section of Cu. Haltere yellow.

2+3

4+5

1+2

Legs: All yellow and not modified except for very slightly thicker femora; fine yellow setulae scattered on all pairs of legs, in addition to somewhat longer setae on fore femur; claws and pulvilli normal.

Abdomen: tg and ep dark brown, moderately shining and with relatively long setulae, the longest on the sides about as long as tg; tg 5 with yellow apical band occupying about 1/4 length of tg and ep with yellow inferior margin. st 5 black and proximal st brown (some of this darkening may be due to postmortem changes).

Postabdomen: Hypopygium small; ep without distinct seta at the ventrocaudal angle; surs short with broad base, not visible in lateral view because it is infolded within ep, cerci small and finely setulose; hyp, in profile, broad basally; ph apd narrow, ej apd small indistinct; prg trapezoidal and setulose on ventral aspect; psg elongate lying transversely, ph moderately pigmented, asymmetrical.

Female. Similar to male except for secondary sexual characters.

Length: ♂ 1.3 mm, wing 1.4 mm; ♀1.7 mm, wing 1.9 mm.

Variation: None noted.

Holotype: ♂ SOUTH AFRICA: Western Cape: Mossel Bay , vi–vii.1930, R.E. Turner (Brit. Mus. 1930-402) ( NHML). Slightly damaged: oc triangle, adjacent part of fr, hindmost orb, verticals and pvt missing.

Paratypes: SOUTH AFRICA: Western Cape: 1♀same data and depository as holotype; 1♀Mossel Bay , vi.1938, R.E. Turner (Brit. Mus. 1939-98) ( NHML); 1♀Atlantic Coast, Ysterfontein, 20.x.1964, B. & P. Stuckenberg ( NMSA) .

ACKNOWLEDGMENTS

I am indebted to the following colleagues for facilitating loans of specimens: John C. Deeming (NMC), Amnon Freidberg (Zoological Museum, TAU), Ashley H. KirkSpriggs (Albany Museum, Grahamstown, South Africa; formerly of NMNW); Marion Kotrba (ZSM); Mikhail Mostovski and his predecessor David Barraclough (NMSA); Eugene Marais (NMNW); Michael von Tschirnhaus (University of Bielefeld, Germany); Nigel Wyatt (NHML). I also thank the reviewers Wayne Mathis (Smithsonian Institution, USA) and David Barraclough (University of KwaZulu-Natal, Durban, South Africa) for many helpful comments on an earlier draft.

Figures

Figs 25, 26. Male hypopygia, lateral aspect: (25) G. stuckenbergi sp. n., (26) G. turneri sp. n. Scale bars = 0.3 mm.