Udzungwomyia brevitarsa, 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 : 118-119

Udzungwomyia brevitarsa sp.n.

Figs 7–14 .

MATERIAL. Holotype ♂, Republic of South Africa, [Kwa- Zulu-] Natal Province , Drakensberg Mountains (2929Ad), Giant’s Castle Reserve , 5800 ft, 1.XI.1972, M.E. Irwin ( NMSA). Paratypes. 1♂, 1♀, same data as for holotype ( NMSA; male terminalia dissected and stored in glycerin in microvial pinned with the specimen); 1♂, [KwaZulu-] Natal Province , Drakensberg Mountains (2929Ad), Giant’s Castle Reserve, 5800 ft, 18.X.1971, B. R . Stuckenberg & M.E. Irwin ( NMSA) .

DESCRIPTION. Male ( Fig. 7 ). Length (mm): body 2.5, wing 2.6/0.9, antenna 0.9. Head ( Fig. 8 ). Frons black, grey pollinose; face black, whitish pollinose, narrow; eyes contiguous in middle of face; clypeus silvery white pollinose, convex, slightly wider than high (11/8); facial suture distinctly separating clypeus; antenna ( Fig. 9 ) black; postpedicel small, rounded, slightly higher than long (9/6), with long hairs; arista-like stylus apical, simple, with short hairs apically; length ratio of scape to pedicel to postpedicel to arista-like stylus (stylomeres 1 and 2), 0.06/0.06/0.06/0.04/0.51; proboscis black; palpus enlarged, silvery white pollinose, with white setae; lower postocular setae white; about 5 upper postoculars short, black. Thorax black, with mostly black setae; mesonotum grey-brownish pollinose; pleura whitish pollinose; propleuron with 3 white setae 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 strong setae; mid femur with single anterior preapical seta; mid tibia with pair of anterodorsal and posterodorsal setae at base and 3 short apical setae; mid tarsus simple; hind femur with single short anterior preapical seta; hind tibia ( Fig. 10 ) distinctly thickened and flattened at apex, with 1 anterodorsal seta at base, anterior row of semi-erect setulae in basal half, dorsal row of 5 setae below middle, 2 anterior preapical black setae; 5 short brownish ventral apical setae; hind basitarsus ( Fig. 11 ) thickened in basal half, with small triangular basoventral tooth; tibia and tarsomere (from first to fifth) length (mm): fore leg: 0.71/0.29/0.11/0.07/0.08/0.09, mid leg: 0.88/0.45/0.15/0.09/0.07/0.07, hind leg: 1.13/0.20/0.12/0.08/ 0.09/0.09. Wing ( Fig. 12 ) 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), 0.21/0.15/0.20/0.25; basal section of M 1+2 shorter than distal section (13/20); lower calypter brown, with white cilia; halter brownish. Abdomen black, grey pollinose, with black hairs and short black marginal setae; terga 2–4 laterally whitish pollinose; sterna 2–4 well developed; sternum 4 largest, subquadrate, with 2 lateral groups of 4 strong setae ( Fig. 13 ); sterna 5–6 reduced, membranous; tergum 5 narrow; tergum 6 small, located between tergum 5 and sternum 4, hemispherical, with distal emargination and ventral lobes covered with hairs; tergum 7 semicircular, very narrow, symmetrically lying along posterior margin of tergum 5, bare; segment 8 large, rounded, covered with short white setae; hypopygium ( Fig. 14 ) partly concealed, black; cercus black; epandrium shining, globular, basally asymmetrical, as long as high (lateral aspect), with symmetrical appendages; foramen positioned left laterally; hypandrium midventral, trilobate, with short medial lobe and 2 long thin lateral lobes, each lobe with dorsal tooth; phallus simple, short and thin distally; epandrial lobe broad at base, thin and pointed at apex, with few short setae at base and at apex; surstylus short, with unequal in length and shape arms, both with short setae and hook-like appendix; cercus small, rounded-triangular, with finger-like apex, covered with short white hairs, bearing several long curved 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 1.7 times longer than hind tarsus, with pair of strong anterodorsal and weak posterodorsal setae at base and 3 short apical setae; dorsal setae weak; hind basitarsus distinctly longer than next segment (18/12); abdomen with 5 visible segments; oviscapt concealed.

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

DISTRIBUTION. South Africa (KwaZulu-Natal).

DIAGNOSIS. The new species differs from all other species of the genus in the shortened hind tarsus, with the hind tibia two times longer than hind tarsus. The other species have normal hind tarsus, only slightly shorter than or as long as hind tibia.

Figures

Figs 7–14. Udzungwomyia brevitarsa, sp.n., male: 7 — habitus; 8 — head; 9 — antenna; 10 — hind tibia and tarsus, anterior view; 11 — hind tarsus, ventral view; 12 — wing; 13 — setae on sternum 4 and ventral lobe of tergum 6, lateral view; 14 — details of hypopygial appendages, lateral view. Рис. 7–14. Udzungwomyia brevitarsa, sp.n., самец: 7 — внешний вид; 8 — голова; 9 — усик; 10 — ЗаднЯЯ голень и лапка, вид спереди; 11 — ЗаднЯЯ лапка, вид сниЗу; 12 — крыло; 13 — щетинки 4-го стернита и вентральнаЯ лопасть 6-го тергита, вид сбоку; 14 — детали придатков гипопигиЯ, вид сбоку.