Gymnochiromyia gilva, 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 : 89-91

Gymnochiromyia gilva sp. n.

Figs 2a , 8

Etymology: From Latin gilvus (yellow); refers to the predominant colour of this species.

Diagnosis: A completely yellow species except for the black oc triangle and a large dark brown spot on the ep; acrs in 4 rows at level of transverse suture, more numerous posteriorly between dc; pale setae and setulae.

hyp

Description:

Male.

Head: All yellow; oc triangle yellow with oc ringed black; fr broad, at level of antennae 0.7 width at level of anterior oc and here 1.2 width of eye; fr protruding slightly above antennae. ocp in profile clearly visible behind eye, with short postocular setulae in one irregular row; isolated lower post-genal seta distinct, pale almost white. Gena in profile narrower anteriorly, depth below middle of eye about 0.8 height of eye, yellow with very pale setulae. Mouthparts small, all yellow; setulae of buccal margin relatively short except for two long setae just below vibrissal angle. Face depressed and poorly sclerotised. Antenna yellow, second segment paler than third, with distinct pale seta dorsally; third segment round, finely white pubescent, pubescence a little shorter than diameter of arista at base; arista with black third segment and yellow first and second segments. Chaetotaxy:3 strong orb, anterior inclinate, middle and posterior orb reclinate, all more or less equidistant from each other and with a few fine setulae on orb plate between them; in addition, several fine pale setulae scattered on fr; pvt short, but distinct; 1 vti and 1 vte both strong; oc 0.75 length of hind orb, proclinate and lateroclinate, 0.75 length of vti; setae of fr and vertex brown.

Thorax: Entirely yellow; msn darker yellow but without stripes. Chaetotaxy: 2 hu, one long and one short, 1 psthu, 2 ntpl, 1 sa, 1 pa, 2 dc, acrs in 4 rows at transverse suture, increasing in number posteriorly; 1 mspl, 1 stpl, both with white setulae in front.

Wing: Hyaline, veins all pale brown, distance on costal margin between R 2+3 to R 4+5 is 0.8 that between R and M 1+2; distance between crossveins equal to 0.7 length of apical section of Cu. Haltere yellow.

4+5

Legs: Not modified except for slightly thicker femora; brown setae and setulae scattered on all pairs of legs; in addition longer setae present on fore femur; claws and pulvilli normal.

Abdomen: All tg and st yellow and with brown setae and setulae, the longest about half length of tg.

Postabdomen: ep entirely pale yellow and with pointed anteroventral corner, prg in profile appearing broad trapezoidal, surs short and strongly curved, ph apd and hyp with no distinctive features, ej apd visible, distiphallus very large and more or less globular at apex.

Female. Unknown.

Length: ♂ 1.7 mm, wing 1.8 mm.

Variation: The two paratypes have paler setae and setulae and the acrs in 6 rows. One of these males has the long prescutellar acrs absent.

Holotype: ♂ SOUTH AFRICA: Limpopo: Soutpansberg , 1500 m, 15 km NW Louis Trichardt, 25.xii.1994, A. Freidberg ( TAU).

Paratypes: 1 ♂ same data and depository; 1 ♂ same data ( NMSA) .

Figures

Fig. 2. Gymnochiromyia, posterior aspect of ep, semidiagrammatic, with setae omitted and cerci in outline: (a) gilva sp. n., (b) maraisi sp. n., (c) setulosa sp. n., (d) balteata sp. n., (e) maculiventris sp. n., (f) punctata Ebejer.

Figs 8, 9. Male hypopygia, lateral aspect: (8) G. gilva sp. n., (9) G. maculiventris sp. n. Scale bars = 0.2 mm.