Cheilosia rava, Barkalov & Ståhls, 2022

Barkalov, Anatolij V. & Ståhls, Gunilla, 2022, Cheilosia (Diptera, Syrphidae: Rhingiini) of Nepal with descriptions of 29 new species, European Journal of Taxonomy 829 (1), pp. 1-127 : 103-105

Cheilosia rava sp. nov.

urn:lsid:zoobank.org:act:C365C81B-6759-464D-A03B-83B8D3170F24

Figs 53E–G , 57

Differential diagnosis

Cheilosia (Pollinocheila) rava sp. nov. shares the following characters with the other Palearctic members of the subgenus: male genitalia with surstylus broad in basal part and apically narrower; superior lobes of hypandrium asymmetric; the left process of superior lobe undeveloped, only with a small plate; apical sclerite of aedeagus (distiphallus) with characteristic shape. From all other members of the subgenus C. (P.) rava sp. nov. differs by a combination of the following characters: black, rounded basoflagellomere; distinct shape of face with facial tubercle small and area between antennal pits and facial tubercle less excavated; a completely pollinose body and by structure of male genitalia (these characters partly different in other members of the subgenus).

Etymology

The specific epithet is from the Latin ‘ ravus ’meaning ‘dark-greyʼ referring to the distinct grey pollinosity of the species.

Material examined

Holotype NEPAL • ♂; Prov. Mahakali, Shinae bis Lager am Chamliya Khola bei Batar [Shinae to camp on Chamliya Khola near Batar]; 2000 m a.s.l.; 11 Jun. 2005; J. Weipert leg.; “KF”; IBSJW / NME.

Description

Male

LENGTH. Body 6.8 mm, wing 7.3 mm.

HEAD. Face broad, in anterior view distinctly broadened antero-ventrally, black, densely grey pollinose, except extreme tip of facial tubercle and lower mouth margin shining in narrow stripe; face latero-ventrally with some long yellow pilosity; facial tubercle in lower part of face, small; parafacia moderate in width, width about half width of basoflagellomere; comparatively short yellow pilose and densely grey pollinose; gena broad, densely grey pollinose and yellow pilose; lower part of occiput densely grey pollinose and white pilose. Frons slightly convex, densely grey pollinose and long black pilose, angle of approximation of eyes obtuse. Lunule brown, antennal pits narrowly separated.Antenna black, basoflagellomere rounded, brown pollinose; arista long, black, with very short pilosity. Eye with dense, comparatively long, brown pilosity, length of eye contiguity approximately equal to length of frons without lunule. Vertex slightly convex, long black pilose, ocellar triangle equilateral. Occiput in dorsal part with long and short black pilosity.

THORAX. Postpronotum black, densely grey pollinose and black pilose. Scutum and scutellum black, fine-punctured, with dense brown pollinosity, lateral sides of scutum grey pollinose; with long, not very dense, erect, black pilosity, notopleural area also with long black bristles and one very strong black bristle, scutum posterior of transverse suture with two strong black bristles; scutellum hind margin with very long black bristles longer than scutellum length. Subscutellar fringe with long yellow pilosity. Pleurae densely grey pollinose and mostly yellow pilose, postero-dorsal angle of posterior anepisternum and antero-dorsal angle of anterior anepimeron also with black pilosity, katepisternum with dorsal and ventral pile patches well separated.

LEGS. Mostly black, only basal third of hind tibia brownish; fore coxa without baso-lateral spur; fore femur with black long pilosity posteriorly; mid femur posteriorly with long yellow pilosity in basal part and long black pile apical part; pilosity on anterior part of hind femur yellow in basal half and black in apical half, ventrally with short black pile; all tarsi black.

WING. Long, narrow; entirely microtrichose; slightly brownish, with dark-brown veins; Rs without pilosity; inner angle between veins M 1 and R 4+5 nearly right. Calypter white, with brown rim and yellow pilosity; haltere yellow, with blackish knob.

ABDOMEN. Black, brown pollinose, matte; yellow pilose, pilosity longer on tergites I–II and laterally, tergites II–III medio-posteriorly with some short black pile, hind margin of tergite IV with long black pilosity; sternite IV laterally with densely grey pollinose triangular macula. Sternites densely grey pollinose and yellow pilose.

Female

Unknown.

Distribution

Nepal.

Figures

Fig. 53. A–C. Cheilosia (Cheilosia) pilivena sp. nov., holotype, ♂ (CNC). A–B. Habitus, dorsal and lateral views, C. Wing, vein Rs with pile (indicated by white arrows). – D. Cheilosia (Pollinocheila) quinta Barkalov & Cheng (IBSJW/NME); lateral view. – E–G. Cheilosia (Pollinocheila) rava sp. nov., holotype, ♂ (IBSJW/NME); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.

Fig. 57. Cheilosia (Pollinocheila) rava sp. nov., holotype, ♂ (IBSJW/NME). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing. D. Superior lobe of hypandrium, lateral view. E. Surstylus and gonocercus, lateral view. F. Aedeagus and aedeagal apodeme, lateral view.