Gymnochiromyia malagasica, 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 : 93

Gymnochiromyia malagasica sp. n.

Fig. 11

Etymology: Named for Madagascar, where the holotype was collected.

Diagnosis: A completely yellow species except for a narrow darker line laterally on the msn; distance between R 2+3 and R 4+5 on costa equal to distance between R 4+5 and M 1+2; distance between crossveins 1.4 length of posterior crossvein; these proportions are unique among the species so far described in this genus.

Description:

Male.

Head: All yellow, including oc triangle and oc; fr broad with margins only slightly convergent, at level of antennae 0.9 width at level of anterior oc and 1.2 width of eye; fr protruding only slightly above antennae; ocp in profile barely visible behind eye, with short postocular setulae in one irregular row; isolated lower post-genal seta distinct, pale, almost white. Eye oval, long axis lying almost horizontal. Gena narrower anteriorly; depth below middle of eye about half height of eye, yellow with very pale setulae. Mouthparts small, all yellow; setulae of buccal margin 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 and rather smaller than congeners: pubescence a little shorter than diameter of arista at base; arista entirely yellow. Chaetotaxy: 3 orbs on right side, but 4 on left (middle orb duplicated); pvt short, but distinct and crossed; 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 yellow.

Thorax: Entirely yellow; msn on each side with a narrow darker yellow stripe of apparently coarser texture, running from transverse suture to hind margin between sa and ia lines; hu callus of similar texture. Chaetotaxy: 1 hu and 3 short setulae, 1 psthu, 2 ntpl, 1 short sa, 1 pa, 0+1 dc with a much shorter seta in front, acrs in 6 rows at transverse suture increasing in number posteriorly, prescutellar pair short and wider apart than usual, thus each is distinctly closer to hind dc than to each other; 1 mspl, 1 stpl, both with a shorter adjacent seta and white setulae in front.

Wing: Hyaline, veins all pale yellow, distance between R 2+3 and R 4+5 on costa equal to distance between R 4+5 and M 1+2; distance between crossveins 1.4 length of posterior crossvein. Haltere pale yellow.

Legs: Not modified except for slightly thicker front femur; pale setae and setulae scattered on all pairs of legs, in addition longer setae present on fore femur.

Abdomen: All tg and st pale yellow and with short setulae.

Postabdomen: ep appears more globular than congeners, ph apd short and broad, hyp more or less parallel-sided in side view and small; prg small, narrow and very finely setulose, surs sinuate and truncate at apex, psg and bac scl not identified, distiphallus complex and mostly membraneous.

Female. Unknown.

Length: ♂ 1.5 mm, wing 1.4 mm.

Holotype: ♂ MADAGASCAR: coastal dry scrub north of Toliara, 15.ii.1984, M. von Tschirnhaus, in alcohol (tube label: 1179) ( ZSM).

Figures

Figs 11, 12. Male hypopygia, lateral aspect: (11) G. malagasica sp. n., (12) G. maraisi sp. n. Scale bars = 0.2 mm.