Cheilosia indistincta, 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 : 61-64

Cheilosia indistincta sp. nov.

urn:lsid:zoobank.org:act:B7EF4C57-DDAF-4949-87AA-2C7C7DE56194

Figs 32B–C , 33

Differential diagnosis

Cheilosia (Floccocheila) indistincta sp. nov. agrees with the other members of the subgenus in the following characters: a broad, densely pilose body, antennal pits separated, wing infuscated, eye pilose, and scutum without strong bristles. Cheilosia (F.) indistincta sp. nov. is similar to C. (F.) illustratoides sp. nov. and C. (F.) vellea sp. nov. for distinguishing characters see under C. (F.) illustratoides sp. nov.

Etymology

The specific epithet is from the Latin ‘ indistinctus ’, and refers to the fact that the species is obscure (hard to distinguish from morphologically similar species).

Material examined

Holotype NEPAL • ♂; Prov. Seti, 25 km SW of Simikot, Kuwadi Khola E of Saipal; 29°53.4′ N, 81°36.2′ E; 3600 m a.s.l.; 4 Jul. 2001; J. Weipert leg.; IBSJW / NME.

Paratype NEPAL • ♂; Westnepal , Distr. Bajura, Simikot 19 km W of Kuwadi Khola; 29°53′14″ N, 81°38′04″ E; 3500 m a.s.l.; 5 Jul. 2001; Creutzburg leg.; NME .

Description

Male

LENGTH. Body 12–13 mm, wing 10–11 mm.

HEAD. Face in anterior view broad, broadest medially with cheek moderately convex latero-medially; in lateral view moderately protruded; black, non-pilose, slightly grey pollinose, except shiny along ventral mouth margin and area around facial tubercle; facial tubercle of moderate size, not distinct; parafacia broad, in broadest part almost equal to width of basoflagellomere, grey pollinose and long, yellow pilose in dorsal ⅔, with mixed yellow and black pilosity on ventral ⅓, pilosity longer than eye pilosity; gena broad, grey pollinose and long yellow pilose. Frons moderately convex, grey pollinose, more densely pollinose narrowly along eye, with long yellow and black pilosity; frontal angle approximately right; lunule yellow or brown, antennal pits distinctly separated. Antenna blackish-brown, basoflagellomere oval, densely brown pollinose; arista long, black, with very short pile (clearly shorter than width of arista at broadest point). Eye with dense, moderately long black pilosity; eye contiguity almost equal to length of frons without lunule. Vertex inflated, grey pollinose and long yellow pilose, ocellar triangle equilateral. Occiput densely grey pollinose, yellow pilose.

THORAX. Postpronotum black, grey pollinose and yellow pilose. Scutum with moderately strong puncturation, shiny black, grey pollinose on anterior part and notopleural area, and narrowly at postalar calli and anterior to scutellum; with dense, long, yellow pilosity on pollinose parts and long, black pilosity on shiny part forming a broad black band between wing bases, black pilosity longer in posterior part; without strong black bristles. Scutellum medially shiny on disc, all margins grey pollinose, with dense yellow and black pilosity, scutellar margin without strong bristles. Subscutellar fringe with long yellow pilosity. Pleura densely grey pollinose, with long dense yellow pilosity, anepisternum on posterior part also with black pilosity, katepisternum completely and contiguously yellow pilose, but ventrally also with some black pile; anepimeron with mixed yellow and black pilosity. Metasternum yellow pilose, mixed with a few black pile.

LEGS. Coxa black, grey pollinose and black and yellow pilose; fore coxa without baso-lateral spur; femora black with yellowish tips, antero-ventrally with dense, long black pilosity up to 1.5–2× longer than width of femur, and some yellow pile on posterio-basal ⅓ part, hind femur antero-ventrally and ventrally with long whitish pilosity in basal ⅔; tibia brown on basal ⅓–½ and on tips and black otherwise, with black pilosity; tarsi black dorsally and yellow ventrally.

WING. Entirely microtrichose; finely brownish in apical half and along cross veins; inner angle between veins M 1 and R 4+5 right; Rs with about four short, black pile. Calypter mostly yellow, black basally, fringe yellow. Haltere with stem yellow and black knob, knob ventrally with some short black pile.

ABDOMEN. Broadly oval, in broadest part broader than scutum at level of wing base, brownish-black; tergite I densely grey pollinose and yellow pilose, tergite II with long reddish and yellowish pilosity, tergites III and IV with long, black pilosity on lateral margin extending from anterior margin to ⅔ of margin, and long yellow pilose otherwise. Sternites black-brown, pollinose, with mixed long black and yellow pilosity, sternite I only with long, whitish pilosity.

Female

Unknown.

Distribution

Nepal.

Figures

Fig. 32. A. Cheilosia (Endoiasimyia) indiana (Bigot, 1883), female head (CNC). – B–C. Cheilosia (Floccocheila) indistincta sp. nov., holotype, ♂ (IBSJW/NME); dorsal and lateral views. – D–E. Cheilosia insolita sp. nov., holotype, ♀ (CNC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.

Fig. 33. Cheilosia (Floccocheila) indistincta sp. nov., holotype, ♂ (IBSJW/NME). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of 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.