Cheilosia nepalensis, 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 : 77-81

Cheilosia nepalensis sp. nov.

urn:lsid:zoobank.org:act:7ECE23DE-3204-4BE8-8BE0-34F58D876058

Figs 43–44

Differential diagnosis

Cheilosia (Taeniochilosia) nepalensis sp. nov. shares the structure of the genitalia of males, especially that of the gonopods (superior lobes of the hypandrium), with the other members of the subgenus Taeniochilosia , but is the only species with entirely pilose eyes. In one additional taxon, C. aff. faucis from Bulgaria, the females have eye with very short and scattered pilosity. From all other species if differs by the following combination of characters: eye pilose, antennal pits confluent or nearly so, and legs black.

Etymology

The specific epithet is from the Latin, and refers to the country of Nepal.

Material examined

Holotype NEPAL • ♂; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 26 May 1967; Can. Nepal Exped.; CNC.

Paratypes NEPAL • 2 ♂♂; same data as for holotype; CNC • 4 ♂♂; 20°00′ N, 84°59′ E; 12 000–13 000 ft a.s.l.; 20 Jun. 1967; Can. Nepal Exped.; CNC • 4 ♂♂, 1 ♀; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 18 Jun. 1967; Can. Nepal Exped.; CNC • 1 ♀; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 20 Jun. 1967; Can. Nepal Exped.; CNC .

Description

Male

LENGTH. Body 5.7–8.2 mm, wing 6.0– 8.5 mm.

HEAD. Face rather broad, in anterior view ventrally moderately widened, black, almost completely densely grey pollinose except on tip of facial tubercle and partly near lower mouth margin; facial tubercle distinct, laterally compressed and narrow; parafacia very broad, approximately equal to basoflagellomere width, densely grey pollinose, with dense, short, semi-erect, white pilosity; gena wide, densely grey pollinose and long, dense, yellow pilose, a yellowish spot ventral to eye. Frons slightly inflated, densely grey pollinose and black pilose, frontal angle slightly>90°; lunule black, antennal pits distinctly confluent. Antenna black; scapus and pedicel with grey pollinosity; basoflagellomere quadrate to subquadrate in shape, densely grey pollinose; arista very long, black, shiny, with short pilosity. Eye entirely, densely, yellow pilose; eye contiguity slightly shorter than length of frons without lunule. Vertex inflated, black, with grey pollinosity and long, black pilosity; ocellar triangle isosceles. Occiput posteriorly with black pilosity, anteriorly with yellow pilosity.

THORAX. Postpronotum black, densely grey pollinose and short, yellow pilose. Scutum fine-punctured, black with grey pollinosity and five longitudinal stripes of dense brown pollinosity, anteriorly and posteriorly (near scutellum) yellow pilose, otherwise black pilose, laterally with some moderately strong black bristles; scutellum brownish-grey pollinose and short yellow and long black pilose; scutellum margin with 2–3 long, fine black bristles. Subscutellar fringe long, yellow. Pleura densely grey pollinose and moderately long, scattered yellow pilose; postero-dorsal corner of anepisternum with some black, bristle-like pilosity; dorsal and ventral pile patches of katepisternum broadly separated, metasternum with yellow pilosity.

LEGS. Fore coxa without lateral spur, black with yellowish tip, densely grey pollinose and short yellow pilose; femora black with yellow tips, fore femur slightly inflated, pilosity on fore and mid femur comparatively short, yellow, hind femur without antero-ventral pilosity; tibia orange-yellow with black rings on apical half; tarsi dull, black, or segments 1–2 of mid tarsus yellowish.

WING. Distinctly brownish with black veins, completely covered with microtrichia. Vein Rs dorsally with some short, black pilosity; inner angle between veins M 1 and R 4+5 acute. Haltere brown with black knob; calypter yellow with brown rim and yellow pilosity.

ABDOMEN. Elongate, oval, in broadest part narrower than mesonotum at level of wing base, black with bluish reflection and fine grey pollinosity, mainly yellow pilose, pilosity longer laterally, and with some black, appressed pilosity on hind margin of tergites III–IV. Sternites densely grey pollinose, with long and short yellow pilosity, some black pilosity postero-laterally on sternite IV. Pre-genital segments black pilose.

Female

LENGTH. Body 7.6–8.0 mm, wing 7.5–8.1 mm.

HEAD. Parafacia broader than in male, and gena very broad. Frons moderate in width, distinctly broadened anteriorly, with three longitudinal furrows, covered with dense greyish-brown pollinosity and short, semierect yellow and longer erect black pilosity.

THORAX. Scutum with pollinosity as in male, with short semi-erect yellow and black pilosity and some long, erect black pilosity on posterior ⅓; laterally with strong, long black bristles, scutellum with semierect short, yellow pilosity, hind margin with 2–4 strong, long black bristles.

LEGS. Paler in colour than in male, fore and mid tibia yellow with brownish tinge, mid basitarsus yellowish, tarsomeres 1–3 of hind tarsus with yellowish tip.

ABDOMEN. Oval, in broadest part approximately equal to or slightly broader than mesonotum at level of wing base, densely grey pollinose, pilosity yellow and black, laterally longer and medially shorter. Otherwise as the male.

Distribution

Nepal.

Figures

Fig. 43. Cheilosia (Taeniochilosia) nepalensis sp. nov.;A, C, E–H = holotype, ♂ (CNC), B, D = paratype, ♀ (CNC). A. Head, lateral view. B. Head, dorsal view. C–D. Antenna, lateral view of pedicel and basoflagellomere. E. Tip of wing.F. Superior lobes of hypandrium, lateral view. G. Aedeagus and aedeagal apodeme, lateral view. H. Surstylus and gonocercus, lateral view. Scale bars indicated in drawings.

Fig. 44. Cheilosia (Taeniochilosia) nepalensis sp. nov. A–B. Holotype, ♂ (CNC); dorsal and lateral views. C–D. Paratype ♂ (CNC), dorsal and lateral views. E. Holotype, head. Photo: Pekka Malinen, FMNH Luomus. Scale bars: A–D = 1 mm; E = 0.5 mm.