Cheilosia pilivena, 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 : 93-97

Cheilosia pilivena sp. nov.

urn:lsid:zoobank.org:act:75FCCE63-8716-4F07-8B2B-74C2F6F04086

Figs 52 , 53A–C

Differential diagnosis

Structure of male genitalia (shape of apical sclerite of aedeagus and superior lobe of hypandrium) is similar to other members of the nominal subgenus. The new species has pilosity on vein Rs, which in combination with other characters (very broad parafacia and absence of black bristles on scutellum hind margin) easily separates the taxon from all other members of the subgenus.

Etymology

The specific epithet is from the Latin ‘ pilosus ’ meaning ‘hairy’ and ‘ vena ’ mening ‘vein’, and refers to the pile present dorsally on wing vein Rs, unusually long in the species.

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 • 1 ♀; Solukhumbu, Junbesi to Ringmo; 27°34′ N, 86°35′ E; 2700–3000 m a.s.l.; 12 May 1997; Hauser leg. [515]; CSCA • 1 ♂; Prov. Karnali, Hochtal Gothichaur ; 29°12,10′ N, 82°18,56′ E; 2900 m a.s.l.; 13 Jun. 1997; J. Weipert leg.; “[WS]”; IBSJW / NME .

Description

Male

LENGTH. Body 9.6 mm, wing 8.9 mm.

HEAD. Face broad, in anterior view clearly broadened ventrally, shiny black, pollinose ventral to antenna, and small patches of pollinosity laterally, without distinct pilosity; facial tubercle characteristic, not very broad nor high, with two small, uneven callosities; parafacia very broad, slightly broader than basoflagellomere width, brownish-black with denser grey pollinosity in dorsal part and less dense in ventral part, with dense, comparatively long yellow pilosity mostly longer than eye pilosity; gena moderately broad, grey pollinose and dense yellow pilose. Frons flat, coarsely punctured; shiny with narrow stripes of grey pollinosity adjacent to eye, with yellow and black pilosity; frontal angle obtuse; lunule dark-brown, antennal pits separated. Scape and pedicel shiny brown, basoflagellomere slightly elongate, bright yellow, arista long, yellow, bare. Eye completely covered with long, dense, brown pilosity; eye contiguity approximately equal to length of frons without lunule. Vertex slightly inflated, with long yellow pilosity, ocellar triangle equilateral. Occiput with yellow pilosity.

THORAX. Postpronotum black, finely grey pollinose and yellow pilose. Scutum shiny black, laterally with slight pollinosity, fine-punctured, covered with comparatively long, not very dense predominantly yellow pilosity, medially between wing bases a large patch of long black pilosity, no distinct lateral bristles; scutellum shiny black, disc with short and 4–5× longer black pilosity, laterally with long yellow pilosity longer than length of scutellum. Subscutellar fringe with very long and dense yellow pilosity. Pleura black, fine grey pollinose, long yellow pilose except posterior half of anepisternum with mixed black and yellow pilosity; pleura with a brownish integumental stripe extending from wing base to mid coxa; katepisternum with broadly separated yellow pile patches, and with small brownish spot postero-dorsally; metasternum long yellow pilose.

LEGS. Fore coxa without baso-lateral spur, brown, grey pollinose and long yellow pilose; femora black with yellow tips, length of long pilosity on posterior part of fore femur 2× width of femora, mostly black with some yellow pilosity basally; mid femur on posterior part with long, mostly yellow pilosity, some black pilosity on apical ⅓, antero-ventral part of hind femur with very some very long yellow pile, and with some black pilosity on apical ⅓; tibia mostly yellow with more or less broad black rings; tarsi dorsally brownish and ventrally yellow, apical two segments clearly darker.

WING. Slightly brownish, without distinct spot medially, completely covered with microtrichia, vein Rs with 2–4 distinct, rather long pile; inner angle between veins M 1 and R 4+5 right. Haltere all yellow, calypter pale yellow with yellow rim and fringe.

ABDOMEN. Elongate, oval, in broadest part slightly narrower than mesonotum at level of wing base; black with slight bluish reflections, brownish pollinose medially and shiny laterally; with dense, erect yellow pilosity, pilosity longer laterally on tergite II and posteriorly on tergite IV; sternites brownish-black, slightly pollinose, with long erect and short semi-appressed to appressed pale-yellow pilosity.

Female

LENGTH. Body 8.5 mm, wing 8 mm.

HEAD. Face as in male, parafacia very broad, about as broad as basoflagellomere width, brownish-black with denser grey pollinosity in dorsal part and in ventral part reddish-brown and only slightly pollinose, with dense, comparatively long yellow pilosity longer or as long as eye pilosity. Frons broad, slightly broadened anteriorly, black with rather coarse puncturation except area around ocellar triangle, with two densely punctured longitudinal furrows, shiny with triangular grey pollinose maculae at antero-lateral corners, covered with short, erect yellowish pilosity. Antenna with basoflagellomere slightly bigger than in male, orange-yellow; arista yellow, long, with very short pilosity. Eye with scattered, long, yellowish or whitish pilosity.

THORAX. Scutum, scutellum and postalar callus shiny black, with erect, yellowish pilosity, scutellum with longest pilosity of same length as scutellum. Pleura all yellow pilose, katepisternum with dorsal and ventral pile patches broadly separated. Femora black, narrowly yellow basally and yellow apically; tibiae yellow with black annulus of ¼–⅓ of tibia length. For and mid legs yellow pilose, tarsi with basal four segments yellow and apical segment brown. Hind femur with a few scattered long yellow pile along its length, apico-ventrally with short black pilosity, otherwise yellow pilose; hind tarsus dorsally dark.

WING. Brownish, especially along veins.

ABDOMEN. Black, broad, shiny, with yellow erect pilosity on lateral parts of tergites, and medially slightly pollinose on tergites I–III with adpressed or semi-adpressed yellow pilosity. In other characters as the male.

Distribution

Nepal.

Figures

Fig. 52. Cheilosia (Cheilosia) pilivena sp. nov., holotype, ♂ (CNC). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Wing. D. Surstylus and gonocercus, lateral view. E. Superior lobe of hypandrium, lateral view. F. Aedeagus and aedeagal apodeme, lateral view. Scale bars indicated in drawings.

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.