Notiochyromya tripunctata, 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 : 346-348

Notiochyromya tripunctata sp. n.

Figs 8b , 9a , 11

Etymology: From the Latin tri- (three-) and punctata (spotted), and refers to three sets of spots on the tg.

Diagnosis: Relatively large yellow species with very narrow gena and characteristic dark pattern of spots on tg; scut with disc flatter than usual and with 2 pairs of marginal setae; most setae and setulae dark brown to black.

Description:

Male.

Head: All yellow, including oc triangle; fr narrowed anteriorly: at level of antennae 0.6 width that at level of anterior oc and 0.4× width of one eye viewed from in front. ocp yellow, in profile barely visible behind eye; with short postocular setulae irregularly in one row; isolated lower postgenal seta short. Gena very narrow, about 0.2× height of eye at middle, yellow and with pale setulae. Mouthparts small, all yellow, palp round and short, vibrissal seta as long as anterior orb, other setulae of buccal margin short. Face poorly sclerotized and depressed, median carina absent. Antenna yellow, second segment paler than third, with short dark seta dorsally; third segment small and round about 0.25× length of horizontal diameter of eye, finely pubescent hairs shorter than diameter of arista at base; arista black almost throughout and completely bare. Chaetotaxy: 3 strong orb, the anterior strongly inclinate, middle and posterior orb reclinate; pvt minute, barely visible; 1 vti and 1 vte both strong; oc short and strongly lateroclinate; numerous fine short setulae over most of fr, including on intervening spaces between orb setae.

Thorax: Yellow with a pair of light brown stripes in midline of scutum, between dc and ia lines, and posteriorly along sa line; a small brown patch on pprn. Scutum very flat on disc, bare except for 2 pairs of marginals, and with a small brown spot at base ventrolaterally; mtn brownish-yellow; pleura all yellow and paler than disc of scut. Chaetotaxy: 1 pprn and 3 setulae, 1 posthu, 1 pra, 1 sa, 1 pa, 2 ntpl, 1 strong dc and another in front of this about half its size; acrs undifferentiated apart from prscut pair which is a little longer than anterior dc; very short and very numerous setulae over whole of scutum, about 10–12 rows between dc lines at level of transverse suture; anepisternum with numerous scattered setulae in posterior half, 1 strong anepisternal seta directed horizontally backwards from middle of posterior margin of sclerite; 1 katepisternal at upper hind corner of katepisternum.

Wing: Hyaline, veins all pale yellow; costal setulae brown to black with many stouter almost spinose setulae among them; dorsal aspect of costa without spinose setulae; costa beyond hu crossvein narrow but not distinctly broken; R 4+5 and M 1+2 run parallel to wing margin converging only in apical 1/4; distance between R 2+3 and R 4+5 about 0.8 that between R 4+5 and M 1+2; discal cell broadest at level of anterior crossvein; distance between crossveins about equal to length of apical section of vein Cu. Haltere pale yellow.

Legs: Not modified except for slightly thicker femora; generally fine pale setulae scattered on all pairs of legs, in addition about 6 longer setae present on posterodorsal aspect of fore femur; mid tibial apicoventral seta half diameter of tibia at apex, brown; all tarsomeres with several distinctly longer setulae on dorsal aspect, claws and pulvilli normal. Abdomen: Relatively long and narrow, somewhat tapering apically; tg with a pattern of brown spots and bands at base; midline spots on tg 3, 4 and 5, slightly shining and almost black; setulae on discs of tg short, numerous and dark, longest less than half as long as tg; st all yellow.

Postabdomen: ep with distinct dark spot at middle; small and with very short setulae; hyp broad and fused with anterior lower margin of ep; ph apd small, lying within curve of hyp; ej apd very small; prg short with rounded apex, surs short, curved inwards, psg not identified, basiph cuboid; distiph broad mostly membranous.

Female.

Similar to male, but no midline spots or stripe and lateral spots small. Postabdomen not dissected.

Length: ơ and ^body 2.7 mm, wing 2.3 mm.

Holotype: ơ MAURITIUS: Beline , 28.v.2000, J.W. Ismay, mangroves ( OXUM).

Paratypes:1ơ same data as holotype ( OXUM) . SOUTH AFRICA: Eastern Cape: 1^5 km SW Grahamstown [33°16'S: 26°29'E], 10.i.1984, D.J. Brothers ( NMSA) . YEMEN: 1^Mukalia , vi.2001, A. van Harten & M. Hubaishan, light trap ( NMWC) .

Figures

Fig. 8. Dorsal aspect of abdomen: (a) Notiochyromya sexspinosa (Lamb), ^, Nigeria; (b) Notiochyromya tripunctata sp. n., ơ. Scale bar = 0.6 mm.

Fig. 9. Lateral aspect of head:(a) Notiochyromya tripunctata sp. n., ơ; (b) Notiochyromya sexspinosa (Lamb), ^, Nigeria. Scale bar = 0.4 mm.

Fig. 11. Notiochyromya tripunctata sp. n., ơ hypopygium, lateral. Scale bar = 0.2 mm.