Oroschyromya affinis, 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 : 352-354

Oroschyromya affinis sp. n.

Figs 12 , 13

Etymology: From Latin affinis (similar), and refers to the close affinities of this species with O. peruncinata sp. n.

Diagnosis: Pale yellow species with dark fifth tarsomeres; large hypopygium with complex structures easily visible externally; spinose, elongate, separated cerc; differs from sibling species, O. peruncinata sp. n., in details of postabdomen.

Description:

Male.

Head: Yellow, small black oc triangle; not quite twice as broad as long; fr strongly narrowed anteriorly: at level of antennae 0.4 width that at level of anterior oc, at vertex 1.4 width of eye; gena narrow in front, deeper behind and in profile, below middle of eye, about equal to height of eye; yellow and pale haired. ocp in profile visible behind eye and slightly convex; short postocular setulae in one irregular row; isolated lower postgenal seta present, but little longer than other setulae. Mouthparts small, all yellow, palp rather broad almost round; vibrissal setulae moderately developed. Face short, poorly sclerotized and depressed. Antenna yellow; second segment pale yellow with distinct short dark seta dorsally; third segment round, finely pubescent: hairs as long as diameter of arista at base; arista black, only at base of second segment and whole of first segment yellow, minutely pubescent. Chaetotaxy: 3 strong orb, all reclinate; pvt distinct and convergent; 1 vti and 1 vte strong; ocellars long and lateroclinate; no setulae across middle of fr.

Thorax: Uniform pale yellow colour throughout and somewhat elongated with dorsal aspect more flattened than is usual in this family. Chaetotaxy: prpl absent, 0+2 strong dc, the anterior shorter, scutal setulae in 6 irregular rows between dc lines, with one short, but distinct prscut pair; 3 or 4 irregular rows of setulae also between the dc and sa lines; 2 pprn, 1 posthu, 2 ntpl, 1 sa and 1 pa, 1 post ia; 2 pairs of marginal scut setae: one subapical and one basal, no setulae on margin or on disc; anepisternum with about 14 setulae at middle and 1 strong seta directed backwards at middle of posterior margin, katepisternum with about 6 setulae at middle and 1 strong seta at upper posterior corner and a tuft of numerous, fine, long setulae at ventral angle.All setae and setulae pale brown. Wing: Hyaline with pale yellow veins; discal cell widest at apex; distance between R 2+3 and R 4+5 about 0.6 that between R 4+5 and M 1+2; distance between crossveins about 0.9 length of apical section of vein Cu. R 4+5 and M 1+2 parallel, converging only very slightly only towards wing apex. Haltere pale yellow, concolourous with thorax.

Legs: Not modified; fine setulae scattered on all pairs of legs; in addition longer setae present on fore femur, but not as long as diameter of femur; mid tibial apicoventral seta absent; tarsomere 5 of mid and hind legs brown; claws black, pulvilli normal; hind trochanter normal.

Abdomen: Entirely yellow and only slightly compressed laterally towards apex; 5 visible tg, tg 6 very narrow and incorporated within and along anterior margin of ep; st sclerotized; st 5 with ventrally directed pair of narrow projections and long setae on sides of posterior margin. Short setae on disc of tg and some st, about 1/3 length of tg.

Postabdomen: Outwardly almost identical to that in peruncinata (see Figs 29–31 ), ep well-developed and elongated dorsoventrally; cerc large with 3 strong, but short spines in addition to fine setulae, hyp distinct with short, poorly sclerotized flange directed towards base of abdomen, ph apd long and free from hyp, ej apd not recognisable (not sclerotised at all), prg large, heavily sclerotized, anterolaterally directed spine and psg in the form of a flat curved sclerite. distiph large with sclerotized and membranous components and asymmetrical at apex.

Female.

Similar to male, but with exceptionally strong setae on apex of abdomen and on lateral heavily sclerotized discoid-shaped plates of tg 6; strong setae and short setulae on apical margin of tg 5 missing from lateral third on each side. Postabdomen: tg 7 small, narrow and Y-shaped at apex; setulae on st 8 short and obscured from lateral view; hypr small, more or less semicircular and microtrichose.

Length: ơ body 2.0 mm, wing 1.7 mm, ^body 1.9 mm, wing 2.0 mm.

Holotype: ơ YEMEN: Ta’izz [13°34'N: 44°00'E], 3– 24.1.1999, A. van Harten & M. Mahyoub ( NMWC).

Paratypes: ETHIOPIA: 2^Tigray, Axum , 14°08'N: 38°43'E, 2220 m, 4–5.x.2005, A. Freidberg ( TAUI) . KENYA:1ơ S of Lake Naivasha ,YMCA camp, 13.viii.1981, L. Fröberg, meadow at shore ( MZLU) . YEMEN: 1^Suq Bani Mansour , 28.viii–26.ix.2001, A. van Harten, Malaise trap ( NMWC) .

Note: A single female with the following data: NAMIBIA: 1^Keetmanshoop District, Narubis nr Lowen R., 870 m, riverine forest, 20.ii.1974, M.E. Irwin (NMSA), may belong to this species, but as it has been found on the other side of the continent I hesitate to confirm its identity.

Figures

Fig. 12. Oroschyromya affinis sp. n., ơ: (a) apex of hyp, lateral; (b) prg, lateral; (c) psg, lateral; (d) surs, lateral; (e) same, posterior. Scale bars = 0.1 mm. (See Fig. 23 for comparison.)

Fig. 13. Oroschyromya affinis sp. n., ^postabdomen: (a) ventral, (b) lateral, (c) dorsal. Scale bar = 0.2 mm.

Fig. 29. Somatiosoma setipygum sp. n., ơ: (a) hypopygium, lateral; (b) prg, ventral; (c) distiph, lateral, scale bars = 0.15 mm; (d) st 6, ventral, scale bar = 0.2 mm.

Fig. 30. Somatiosoma setipygum sp. n., ^postabdomen, ventral (a) and lateral (b). Scale bar = 0.2 mm.

Fig. 31. Aphaniosoma aethiops sp. n., ơ: (a, b) hypopygium lateral (a) and posterior (b); (c) st 6, ventral. Scale bars = 0.15 mm.