Risa flavicoxa Krivosheina et Ozerov, 2019

Krivosheina, M. G. & Ozerov, A. L., 2019, To the fauna of Risa Becker, 1907 (Diptera: Ephydridae) of Central Asia, Russian Entomological Journal 28 (2), pp. 192-194 : 193-194

Risa flavicoxa Krivosheina et Ozerov , sp.n.

Figs 1 –4.

MATERIAL. Holotype ♂, Turkmenistan: Ishkak , 45 km SW of Kizyl-Ayak [ca. 37.4372°N 65.0267°E], 19.VIII.1973, Nartshuk ( ZISP). Paratypes 2 ♂♂, 2 ♀♀, same labels as holotype ( ZISP and ZMUM) .

DESCRIPTION. Male. Length of body 1.2–1.4 mm. Length of wing 1.0– 1.3 mm.

Head. Frontal vitta and fronto-orbital plate from yellow to blackish, whitish dusted; ocellar triangle black, shining, reaching lunule; face dark brown or blackish, shining, with a rounded protuberance at middle; gena and postcranium blackish, shining. Setae: 3 short fronto-orbitals, 1 short ocellar, no postocellar, 1 inner vertical, 1 outer vertical. Antenna yellow, only postpedicel dorsally darkened; postpedicel conical apically, about as long as wide; arista yellow, bare. Palpus yellow, filiform. Length of proboscis 0.9–1.1 mm.

Thorax completely black, faintly greyish dusted. Acrostichals as hairs in two irregular rows, 1 postpronotal, 2 notopleurals, 1 supra-alar, no intra-alars, 1 postalar and 1 dorsocentral. Katepisternum with strong seta. Scutellum greyish dusted, with a pair of strong basal scutellar and a pair of strong apical scutellar setae.

Legs yellow in ground colour, only femora usually blackish medially.

Wing whitish with whitish yellow veins. Halter whitish.

Abdomen black, faintly greyish dusted. Male sternite 6 bifurcate, with conical lateral lobes ( Fig. 1 ); epandrium oval, truncate posteriorly, with short narrow surstyli and small protuberance below each of them ( Figs 2, 3 ). Female sternite 8 as in Fig. 4.

DIAGNOSIS. The new species differs from all known Central Asian species of Risa by the structure of male epandrium. The other diagnostic characters are given in the key. The structure of epandrium of the new species is similar to those of A. salsolae but the latter species differs in greenish reflection of thorax, black palpus and fore coxa [ Mathis et al., 2017, Fig. 2 ].

DISTRIBUTION. Turkmenistan.

Figures

Figs 1–3. R. flavicoxa sp.n., paratype: 1 — male sternite 6; 2 — epandrium, cerci and surstyli, dorsal view; 3 — same, lateral view; 4 — female sternite 8. Рис. 1–3. R. flavicoxa sp.n., паратип: 1 — стернит 6 самца; 2 — Эпандрий, церки и сурстили, сверху; 2 — то же, сбоку; 4 — стернит 8 самки.