Cheilosia brevimontana, 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 : 24-27

Cheilosia brevimontana sp. nov.

urn:lsid:zoobank.org:act:6E17D58A-087A-4FB4-94A1-274366A36B5D

Figs 9 , 10A–B

Differential diagnosis

Cheilosia (Montanocheila) brevimontana sp. nov. has a strikingly dense pilosity of the body. Among the Nepalese taxa C. (M.) brevimontana sp. nov. is most similar to C. (M.) nigella sp. nov., for distinguishing characters see under C. (M.) nigella sp. nov. From this and all other congeners the new species can be distinguished by the following combination of characters: broad frons and gena, basoflagellomere broader than long, dense mesonotal pilosity with admixed shorter yellowish and long black pilosity, and dense pollinosity on medial parts of scutum and scutellum.

Etymology

The specific epithet is derived from the Latin ‘ brevis ’, meaning ‘short’ or ‘low’.

Material examined

Holotype NEPAL • ♀; Prov. Nr. 3 East, Lager über Bibre [camp near Bibre]; 5430 m a.s.l.; 26 Jul.–9 Aug. 1964; Löffler leg.; ZSMC.

Description

Female

LENGTH. Body 13.7 mm, wing 12.4 mm.

HEAD. Face broad, in anterior view moderately widening ventrally, in lateral view moderately protruded, black, slightly pollinose and shiny, with denser grey pollinosity ventral to antenna and a stripe extending from lower mouth margin to parafacia; non-pilose; facial tubercle moderate in size; parafacia broad, width about ⅔ of basoflagellomere width, shiny black dorsally and grey pollinose ventrally, with long black pilosity of about equal length as eye pilosity; gena moderately broad, black, brown pollinose, long black and pale (white) pilose. Frons broad, with almost parallel sides, with two lateral furrows and a medial furrow which are distinct, densely grey pollinose and comparatively long and very densely black and white pilose; lunule dark-brown, antennal pits distinctly separated. Scape and pedicel black, shiny medially and grey dusted laterally; basoflagellomere broader than long, black, with brownish posteroventral corner, densely brown pollinose; arista very long, black, seemingly bare. Eye entirely long black pilose. Vertex with mixed yellow and black pilosity; ocellar triangle isosceles. Occiput along all length black and yellow pilose.

THORAX. Scutum black, fine-punctured, densely grey pollinose but posterior part and postero-laterally shiny; with black and whitish pilosity of equal lengths on anterior half, in other parts with short yellowish and 2–3× longer black and yellow pilosity, no distinct lateral black bristles. Scutellum brown pollinose medially and laterally shiny, long black pilose, scutellum margin lacking strong bristles; subscutellar fringe with mixed whitish and black pilosity. Pleura black, grey-brown pollinose, with long, dense, black pilosity; katepisternum contiguously (entirely) black pilose; metasternum with long black pilosity.

LEGS. Entirely black, but knees and basal part of tibia narrowly brownish, long pilosity on femora black; fore coxa black, without baso-lateral spur, with greyish-brown pollinosity and black pilosity. Hind femur ventrally and antero-ventrally with long black pilosity, longest pile 1.5× femur width.

WING. Translucent with contrasting dark-brown to black veins, entirely microtrichose; Rs with many short erect pile; inner angle between veins M 1 and R 4+5 acute. Haltere yellow, knob black; calypter yellowishbrown with darker rim and yellow fringe.

ABDOMEN. Elongated, oval, in broadest part almost as broad as scutum at level of wing base; shiny black with bluish reflection; covered with dense, erect, mostly yellow pilosity, some black pile on antero-lateral corner of tergite I and antero- and postero-lateral corners of tergite III, tergite IV on hind margin with almost continuous band of semi-appressed long black pilosity. Sternites pollinose; with erect black and yellow pilosity on sternites I–III and laterally on tergites IV–V, yellow pilosity longer on lateral parts of sternites, and short semi-appressed to appressed black pilosity mainly on posterior parts of sternites II–V.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 9. Cheilosia (Montanocheila) brevimontana sp. nov., holotype, ♀ (ZSMC). A. Head, lateral view. B. Tip of wing. C. Antenna, lateral view of pedicel and basoflagellomere. D. Head, dorsal view. Scale bars indicated in drawings.

Fig. 10. A–B. Cheilosia (Montanocheila) brevimontana sp. nov., holotype, ♀ (ZSMC); dorsal and lateral views. – C–D. Cheilosia (Floccocheila) collis sp. nov., holotype, ♀ (CSCA); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.