Udzungwomyia spinitarsa, Grichanov, 2024

Grichanov, I. Ya., 2024, Four new species of the genus Udzungwomyia Grichanov, 2018 from Lesotho and South Africa (Diptera: Dolichopodidae), Russian Entomological Journal 33 (1), pp. 116-123 : 117-118

Udzungwomyia spinitarsa sp.n.

Figs 1–6 .

MATERIAL. Holotype ♂, Republic of SouthAfrica , [Kwa- Zulu-] Natal Province , Drakensberg Mountains (2929Ad), Giant’s Castle Reserve, 5800 ft, 18.X.1971, B. R . Stuckenberg & M.E. Irwin ( NMSA; male terminalia dissected and stored in glycerin in microvial pinned with the specimen). Paratypes. 4♀, same data as for holotype ( NMSA) .

DESCRIPTION. Male ( Fig. 1 ). Length (mm): body 2.5, wing 2.6/0.9, antenna 0.7. Head ( Fig. 2 ). Frons black, grey pollinose; face black, whitish grey pollinose, narrow, narrowest in middle, half as wide as height of postpedicel; clypeus convex, slightly wider than high (12/9); facial suture distinctly separating clypeus; antenna ( Fig. 3 ) black; postpedicel small, rounded, about as long as high (7/6), with long hairs; arista-like stylus apical, simple, with short hairs apically; length ratio of scape to pedicel to postpedicel to arista-like stylus, 0.04/0.05/0.07/0.59; proboscis black; palpus black, with black setae; lower postocular setae white; about 5 upper postoculars short, black. Thorax black, with mostly black setae; mesonotum grey-brownish pollinose; pleura densely grey pollinose; propleuron with 1 strong white seta and 1 hair in lower part; 4 pairs of strong dorsocentral setae slightly decreasing in length anteriorly; acrostichals absent; scutellum with 2 long strong setae and 2 minute lateral hairs, dorsally bare. Legs black, with mainly black setae; coxae with white hairs and setae; hind coxa with one outer seta; fore leg simple, devoid of setae; mid femur with single anterior preapical seta; mid tibia with pair of anterodorsal and posterodorsal setae at base, 1 dorsal at middle and 3 short apical setae; mid tarsus simple; hind femur with single short anterior preapical seta; hind tibia slightly thickened at apex, with pair of anterodorsal and posterodorsal setae at base, few short dorsal setae, 1 white posterior preapical seta; hind basitarsus excavated ventrally in basal half, thickened in distal half, with few short white setae at apex, with small triangular basoventral process bearing small spine and 2 long thick setae reaching distal 3/4 of basitarsus ( Fig. 4 ); tibia and tarsomere (from first to fifth) length (mm): fore leg: 0.74/0.28/0.11/0.08/0.06/0.08, mid leg: 0.92/0.46/0.19/0.09/0.08/0.09, hind leg: 0.93/0.34/0.28/0.15/ 0.08/0.09. Wing ( Fig. 5 ) greyish, hyaline; basal portion of costa almost straight, bearing simple setae; R 2+3 and R 4+5 gradually diverging to wing apex; R 4+5 and M 1+2 almost parallel in apical part; ratio of part of costa between R 2+3 and R 4+5 to this between R 4+5 and M 1+2 to dm-m to distal part of M 4 (in mm), 0.27/0.23/0.21/0.28; basal section of M 1+2 shorter than distal section (14/17); lower calypter orange, with white cilia; halter blackish. Abdomen (shrunken) black, grey pollinose, with black hairs and short black marginal setae; terga 2–5 laterally whitish pollinose; tergum 1 with white setae; sterna 2–4 well developed; sternum 5 forming large rounded lateral lobes, emarginated distally; tergum 6 large, bare; sternum 6 membranous; tergum 7 semicircular, very narrow, symmetrically lying along posterior margin of tergum 6, bare; segment 8 large, rounded, covered with microtrichia and sparse setae; hypopygium ( Fig. 6 ) concealed, black; cercus black, with short light hairs and long setae; epandrium small, globular, basally asymmetrical, as long as high (lateral aspect), with symmetrical appendages; foramen positioned left laterally; hypandrium midventral, trilobate, forming 2 large lateral lobes expanding distally (lateral aspect), each lobe with dorsal tooth; phallus simple, short and thin distally; epandrial lobe broad, beaklike, with few short setae in distal half; surstylus long and thin, with short setae at apex; unpaired postgonite (or fused lobes of surstylus) long and thin, with brush of setae at apex; cercus small, obovate, covered with short white hairs, bearing several long simple setae; cerci separated, not fused.

Female. Length (mm): body 2.6, wing 2.7. Similar to male except lacking male secondary sexual characters. Legs simple; hind tibia with 3 short apical setae; abdomen with 5 visible segments; oviscapt divided into 2 acanthophorites, each bearing 1 thick seta and 4 long simple setae; cercus fingerlike, projected, with long apical setae and several setulae.

ETYMOLOGY. The specific epithet (Lat. spina; Gr. tarsós) refers to the ‘spined tarsus’ of the male hind leg.

DISTRIBUTION. South Africa (KwaZulu-Natal).

DIAGNOSIS. The new species differs from all other species of the genus in morphology of the male hind basitarsus, which is excavated ventrally in basal half, thickened in distal half, with few short white setae at apex, with small triangular basoventral process bearing small spine and 2 long thick setae reaching distal 3/4 of basitarsus. The other species have more or less simple hind basitarsus, without long thick basoventral setae.

Figures

Figs 1–6. Udzungwomyia spinitarsa, sp.n., male: 1 — habitus; 2 — head; 3 — antenna; 4 — hind tarsus, anterior view; 5 — wing; 6 — hypopygium, left lateral view. Рис. 1–6. Udzungwomyia spinitarsa, sp.n., самец: 1 — внешний вид; 2 — голова; 3 — усик; 4 — ЗаднЯЯ лапка, вид спереди; 5 — крыло; 6 — гипопигий, вид слева сбоку.