Cheilosia falcata, 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 : 42-45

Cheilosia falcata sp. nov.

urn:lsid:zoobank.org:act:5AA76D6D-C495-41C5-8BA2-43429114D43B

Figs 20–21

Differential diagnosis

The character combination of protruded face, presence of distinct baso-lateral spur on fore coxa, broad parafacia and very characteristic structure of male genitalia separates Cheilosia (Cheilosia) falcata sp. nov. from all congeners. See also under Cheilosia (Cheilosia) spinosa sp. nov.

Etymology

The specific epithet is from the Latin ‘ falcatus ’ meaning ‘sickle-shaped’ and refers to the facial tubercle.

Material examined

Holotype NEPAL • ♂; Jumla Distr., N. Ludku ; 2500–2900 m a.s.l.; 11 Jun. 1998; G. Miksch leg.; SMNS.

Paratypes NEPAL • 1 ♂; Maharigaon Nördl ; 29°20′24″ N, 82°23′21″ E; 3400 m a.s.l.; 20 Jun. 1997; Creutzburg leg.; “Weissschale”; NME • 1 ♂; same collection data as for preceding; labcode MZH _ G412 ; IBSJW / NME .

Description

Male

LENGTH. Body 9.8–11.5 mm, wing 9.1–10.0 mm.

HEAD. Face in lateral view strongly protruded forward, black, bare, except tip of facial tubercle and mouth edge; densely grey pollinose; facial tubercle moderate in size and laterally compressed; parafacia broad, in broadest part approximately equal to basoflagellomere width, with dense silvery pollinosity and dense, short, semi-erect, white pilosity; gena narrow, with dense silvery pollinosity and comparatively long white pilosity. Lower part of occiput with dense silvery pollinosity and white pilosity. Frons slightly inflated, small, with silvery pollinosity and long black pilosity; frontal angle acute (distinctly <90°). Lunule dirty yellow, medial prong with a clear dividing central furrow; antennal pits distinctly separated. Antenna black; basoflagellomere small, rounded, black, with brownish pollinosity; arista long with very short pilosity. Eye all densely pilose, pile long and pale-yellow. Eye contiguity almost twice the length of frons without lunule. Vertex shiny black, flat, covered with long black pilosity; ocellar triangle equilateral. Occiput dorsally with long black and short yellow pilosity.

THORAX. Postpronotum black, densely grey pollinose and black pilose; scutum fine-punctured, shiny black, matte antero-laterally in front of transverse suture and narrowly anterior to scutellum, notopleural area grey pollinose, with short semi-appressed yellow and 2–3 times longer erect black pilosity; postalar callus with many long, black, fine bristles; scutellum matte on anterior and posterior margins, shiny otherwise, with short semi-appressed and long, erect, black pilosity; subscutellar fringe long, dense, white. Pleura densely grey pollinose and with long semi-appressed white pilosity; postero-dorsal corner of posterior anepisternum and dorsal part of anterior anepimeron with some black pilosity, dorsal and ventral pile patches of katepisternum separated, ventral pile patch with white, erect pilosity; metasternum with a few white pile.

LEGS. Coxa black, densely silvery pollinose, fore coxa with baso-lateral spur; trochanter shiny black; femur black except yellow on extreme tips; tibia mainly black, basal ⅓ of fore tibia, basal ⅖ and apical ⅕ of mid tibia yellowish; tarsi black dorsally; long pilosity on posterior part of fore femur mostly black, some pale pilosity near base; long pilosity on posterior part of mid femur mostly white with some black pilosity; hind femur with a row of short black bristles ventrally, and white, long, fine white pilosity antero-ventrally.

WING. Elongated, with brownish tinge, entirely microtrichose; vein Rs without short pile; vein M 1 meeting vein R 4+5 obliquely. Haltere yellow, with knob partly black. Calypter white with brown base, rim and pile yellow.

ABDOMEN. Narrow, elongated, in broadest part distinctly narrower than scutum at level of wing base; terga black, laterally shiny, finely brownish pollinose medially; with long, erect, white pilosity laterally and short, appressed, black pilosity medially; some black long pilosity on tip of tergite IV. Sternites densely grey pollinose, sternites I–II with only erect white pilosity, sternites III–IV with long, erect, white and short semi-erect white and black pilosity. Genitalia as in Fig. 20 , note the short left process and bent right process of the superior lobe.

Female

Unknown.

Distribution

Nepal.

Figures

Fig. 20. Cheilosia (Cheilosia) falcata sp. nov., holotype, ♂ (SMNS). A. Head, lateral view. B. Angle approximation of eyes (indicated by bent arrow). C. Antenna, lateral view of pedicel and basoflagellomere. D. Tip of wing. E. Surstylus and gonocercus, lateral view. F. Superior lobe of hypandrium, lateral view. G. Aedeagus and aedeagal apodeme, lateral view. Scale bars indicated in drawings.

Fig. 21. Cheilosia (Cheilosia) falcata sp. nov. A–B. Holotype, ♂ (SMNS); dorsal and lateral views. C–D. Paratype, ♂ (IBSJW/NME); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.