Cheilosia (Montanocheila) vadimi, Barkalov, 2020

Barkalov, Anatolij V., 2020, New data on the genus Cheilosia Meigen (Diptera, Syrphidae) from Central Asia with descriptions of two new species and a key to the ‘ group C’, Zootaxa 4860 (2), pp. 243-256 : 246

Cheilosia (Montanocheila) vadimi sp. nov.

Figs 2 A–G

Type material. HOLOTYPE. Kazakhstan ( South East ): 1♂, Djungarskij Alatau, 45 km N E Tekeli town, upper reaches Kora river, 2800 m a.s.l., 19.vi.1993, leg. V. Zinchenko, SZMN . PARATYPES. Kazakhstan ( South East ). 2♀, Djungarskij Alatau, 45–50 km N E Tekeli town, upper reaches Kora river, 2600 m a.s.l., 18.vi.1993, leg. V . Zinchnko, SZMN.

Differential diagnosis. C. vadimi sp. nov. belongs to the subgenus Montanocheila ; the male is close to C. kirgizorum Peck but differs by the shorter hairs on eyes and scutum and a completely different shape of the superior lobe of hypandrium (see Figs 2 E–G and Figs 4 D–F). Because of great variation in the color of the pilosity between males and females, the female in the key runs to C. thalassica Peck (but the female of this species is unknown).

Description. MALE. Size. Body length 11.4 mm, wing length 10.4 mm. Head. Face moderately broadened ventrally, black, shiny ventrally, dusted grey dorsally, denser under antennae base, without any hairs ( Fig. 2A ); central knob small and narrow; eye-margin moderately wide, shiny black without dusting, covered with short black hairs. Cheeks comparatively shallow, black with fine grey dusting and black and yellow hairs. Frons flat, covered with fine grey dusting and comparatively short black hairs, frontal angle distinctly less than 90°, lunula brownishblack; antennal pits separated. Scapus and pedicel black, postpedicel reddish, darkened antero-dorsally, arista long, bare black ( Fig. 2C ). Eyes completely covered with dense yellow hairs; eye connection longer than frons length without lunula. Vertex finely swollen, shiny, with comparatively short black hairs, ocellar triangle equilateral. Thorax. Pronotum shiny black with black hairs. Mesonotum shiny black with fine granulation and dense, erect black hairs, longer on posterior parts of scutum and scutellum; without distinct black bristles. Subscutellar fringe long, black. Pleura with grayish-brown dusting and long dense black hairs. Legs: coxa black with grey dusting, fore coxa without antero-lateral spur; femora black with extreme tips yellow, fore- and mid-femora with long black hairs posteriorly, long hairs on hind femur yellow and black, short hairs black anteriorly and yellow posteriorly; tibia yellow in basal 1/3–1/2 and on tips, and black elsewhere; tarsi black dorsally and yellow ventrally. Wings slightly brownish along veins, completely covered with microtrichia, inner angle between veins M 1 and R 4+5 equal to 90°. Squama yellow with yellow cilia, haltere yellow with black head. Abdomen oval, in the broadest part equal to scutellum width at the level of the wing base; shiny black, tergites covered with long dense erect yellow hairs longer on sides of tergites I–II. Sternites with yellow hairs. Genitalia as in Figs 2 E−G.

FEMALE. Body length 11.3–13.5 mm, wing length 10.3– 9.8 mm. Similar to male except following characters. Eye-margin broad with grey dusting dorsally and shiny ventrally, covered with long yellow hairs. Frons moderate in width, with 3 distinct longitudinal furrows ( Fig. 2B ), covered with erect hairs, completely yellow or with black hairs on posterior 1/3. Lunula light-brown. Postpedicel of antennae enlarged, with darkened antero-dorsal part ( Fig. 2D ), covered with dense grey dusting. Occiput with grey dusting and black or yellow hairs. Scutum with dense, erect, comparatively short yellow hairs (in one specimen with band of black hair between base of wings). Pleurae with yellow hairs. Long hairs on fore and mid femora yellow basally and black apically, hind femora with mostly yellow hairs, only on apical 1/3 with some black hairs. Abdomen broadly-oval, in the broadest part wider than scutum on level of wing base.

Etymology. The species is named after the collector of the material, Vadim Konstantinovich Zinchenko.

Figures

FIGURE 2. Cheilosia vadimi sp. nov. A: head of male, lateral view. B: head of female, dorsal view. C: pedicel and postpedicel of male, lateral view. D: pedicel and postpedicel of female, lateral view. E: surstylus and gonocercus, lateral view. F: superior lobe of hypandrium, lateral view. G: aedeagus with apodeme. Scale bar in mm.

FIGURE 4. Cheilosia vtorovi (A–C), Cheilosia kirgizorum (D–F), Cheilosia heptapotamica (G) and Cheilosia xanthella (H). A, D: surstylus and gonocercus, lateral view. B, E: aedeagus with apodeme. C, F: superior lobe of hypandrium, lateral view. G, H: tip of wing. Scale bar in mm.