Oroschyromya elongata, 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 : 360-363

Oroschyromya elongata sp. n.

Figs 19 , 20

Etymology: From Latin longus (long), and refers to the unusually long cerci and pregonites of this species.

Diagnosis: Relatively large species of deep yellow colour heavily marked with dark brown or black; parafacial densely silvery white pruinose; 1+4 dc setae and in male, elongate cerc and very long curved prg.

Description:

Male.

Head: Yellow, a little broader than thorax; oc triangle black between ocelli; fr narrow, strongly converging, at level of antenna 0.4 width of that at anterior oc and 0.14 width of head, about 14 minute pale brown setulae scattered on fr; ocp yellow, in profile, flat and not visible behind eye margin, short postocular setulae in one irregular row; eye, elongated oval, 1.5 times as long as high, lying obliquely, anterior facets about 3× size of posterior facets; gena, slightly recessed and broad, below in profile about 0.8 height of eye at middle; pale setulose with 3 long setae on oral margin just below vibrissal angle, isolated lower postgenal seta pale and as long as anterior orb; mouthparts yellow, palp round; face short, depressed and no carina visible, parafacial with dense silvery white pruinosity when viewed at an angle; antenna with all segments yellow, second with long dark seta dorsally; segment 3 abort 0.25 length of horizontal diameter of eye, finely pubescent, pubescence as long as diameter of arista at base; arista black except on segments 1 and 2, where it is yellow. Chaetotaxy: 3 orb, anterior inclinate, middle and posterior orb reclinate, all equidistant from each other; 1 vti and 1 vte a little longer than hindmost orb; pvt crossed, about as long as anterior orb, ocellars a little more than half length of vt; all setae brown.

Thorax: Yellow with sparse pruinosity on scutum; scutum deeper yellow, scut, mtn and pleura all yellow. Chaetotaxy: 2 pprn, one short, and fine setula adjacent, 1 posthu, 2 ntpl, absent pra, 1 sa, 1 pa, 1 short post ia, 1+4 dc, anterior 2 short and difficult to separate from other scutal setulae, scutal setulae in 8 irregular rows between dc lines, prscut pair longer; scut 4 marginals, subapical pair about twice length of scut; 1 anepisternal at middle of hind margin with shorter seta above it, 1 katepisternal close to upper hind corner; both sclerites with additional pale setulae in front of setae and katepisternum with long white setulae above coxa; all other setae on thorax brown.

Wing: Hyaline with pale yellow tinge over entire membrane; veins yellow; vein closing anal cell convex, distance between crossveins about 1.8× length of posterior crossvein and about 0.9 length of apical section of vein Cu; costa without break near hu crossvein; costal setulae along anterior margin with several dark spine-like setulae interspersed and about 7 similar setulae on dorsal aspect of costa; distance on costal margin between R 2+3 and R 4+5 about 0.7 that between R 4+5 and M 1+2, latter two veins parallel up to apex of wing. Haltere yellow, concolourous with pleura.

Legs: Yellow, all segments slender and rather long; tarsomere 5 of all legs dark brown in apical half to 2/3; fine setulae scattered on all pairs of legs, in addition longer setae present on dorsal and posterior aspect of fore femur; mid tibial apicoventral seta absent; all setae and setulae pale brown to yellow; claws black except at extreme base and pulvilli normal.

Abdomen: Yellow, rather elongate and narrow; tg with comparatively long setulae and setae, several about 0.75 length of tg; st pale yellow, sclerotized and with a few long setae; tg 6 clearly visible, about half length of tg 5 and 0.8 length of ep; st 6 distinguishable as narrow V-shaped sclerite, st 5, on each side with a lobe projecting backwards and long setae.

Postabdomen: ep yellow, large and higher than long; cerc narrow, very elongate and distinctly setulose; surs short and broad; prg very long curved with a single strong seta at base.

Female.

As in male, but palp spatulate and larger; scutum often with 4 longer acrs; abdomen darker from deep yellow to dark brown, with most specimens showing distinctive pale longitudinal stripe giving appearance of divided tg at least on apical segments.

Postabdomen: tg 7 sclerotized only at middle apically, tg 8 with partly desclerotized central section and not setulose; st 8 oval in ventral view and with setae only along medial margin; hypr large thinly sclerotized and at middle with parallel series of microtrichia; cerc elongate and narrow.

Length: ơ body 2.0 mm, wing 2.2 mm; ^body 2.1 mm, wing 2.5 mm.

Holotype:ơ ETHIOPIA: Gonder , Goha Hotel, 12°37'N: 37°28'E, alt. 2360 m, 1.x.2005, A. Freidberg ( TAUI) . Paratypes: ETHIOPIA: 4ơ 1^same data as holotype ( TAUI); 1^Gonder Province , Simien Mts National Park, 17 km NE Debark, 13°13.91'N : 30°01.86'E , 3200 m, 25.iii.1995, M. von Tschirnhaus (in alcohol, ZSMC); 1^Kefa Jimma , 35 km S , 2700 m, 12.ii.2000, A. Freidberg & I. Yarom; 1^Bale , Bale Mts, Robe, 30 km W , 2900 m, 3.ii.2000, A. Freidberg & I. Yarom; 4ơ 3^Shewa , Debre Tsige, 09°39'N : 38°49'E , 2660

m, 28.ix.2005, A. Freidberg (all TAUI); 2ơ 2^same data ( NMWC); 2ơ 2^same data ( BMNH); 2ơ 2^same data ( NMSA); 2ơ 1^Shewa, Chancho, 09°23'N: 38°48'E, 2500 m , 28.ix.2005, A. Freidberg ( TAUI) .

Figures

Fig. 19. Oroschyromya elongata sp. n., ơ: (a) hypopygium, lateral, scale bar = 0.2 mm; (b) sternites 5 & 6, ventral, scale bar = 0.15 mm.

Fig. 20. Oroschyromya elongata sp. n., ^postabdomen: (a) lateral, (b) ventral, (c) dorsal. Scale bars = 0.35 mm.