Cheilosia flavigena, 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 : 45-47

Cheilosia flavigena sp. nov.

urn:lsid:zoobank.org:act:8491EE88-41DC-4217-BF15-FD7133A05566

Figs 22–23

Differential diagnosis

Cheilosia flavigena sp. nov. is described from a single female specimen. As the male sex of the new species remains unknown, a subgeneric placement of the new taxon is not proposed. Characteristics like yellow parafacia, eye short pilose, separated antennal pits and brown colour of body separates C. flavigena sp. nov. from all other known species of the genus Cheilosia . See also under C. versa .

Etymology

The specific epithet ‘ flavigena ’ is from Latin and refers to the yellow colour of gena.

Material examined

Holotype NEPAL • ♀; 29°00′ N, 85°00′ E; 9900 ft a.s.l.; 27 May 1967; Can. Nepal Exped.; Malaise trap 7; CNC.

Description

Female

LENGTH. Body 8.0 mm, wing 8.2 mm.

HEAD. Face comparatively narrow with almost parallel sides, shiny, black, with pollinosity ventral to antennal base and with slight dusting laterally, dorsally close to parafacia with some moderately long, erect, pale pile; facial tubercle small, well protruded; parafacia very narrow, with ¼ to ⅕ of width of basoflagellomere, yellow, with white pollinosity and short, scattered yellow pile. Gena moderate in width, shiny, black but narrowly yellow ventral to eye, with short, white pile. Frons inflated, brownish, moderate in width, with strong transversal depression anteriorly, with longitudinal depression between median prong of lunule and transverse depression, and with lateral longitudinal furrows near eye, lateral longitudinal furrows with yellow macula anteriorly, frons covered with anteriorly directed, moderately long and dense black pilosity. Lunule bright yellow, antennal pits broadly separated. Antenna bright yellow, basoflagellomere large, oval, with some sensory pits in basal half; arista unusually long and narrow, bare, yellow in basal ⅕ and otherwise black. Eye with very short while pilosity. Vertex shiny, with black pilosity. Occiput shiny with short black pile, ocellar triangle isosceles.

THORAX. Postpronotum shiny-brown with short, pale pile. Scutum shiny, dark-brown, with coarse punctuation, with four vittae of grey pollinosity, two medial vitta extend from anterior part of scutum to mid part, and lateral vitta extend from transverse suture to end of postalar callus; pilosity black, short, semi-erect; postalar callus with 2–3 strong black bristles. Scutellum brown, shiny, with short black pilosity, hind margin with four strong, long, black bristles and some shorter bristles. Subscutellar fringe of short pale and black pile. Pleura brown, shiny, with very fine grey pollinosity, with small yellow macula on antero-dorsal corner of anterior anepisternum; pleura covered with short, scattered yellow pile, with some black pile on dorsal part of anepimeron; katepisternum with dorsal and ventral pile patches narrowly separated; metasternum with yellow pilosity.

LEGS. Coxa brownish-yellow, fore coxa without baso-lateral spur; femora brown with yellow tips, long pilosity mostly yellow, with some black pile dorso-apically; tibia yellow, with more or less broad brown rings; tarsi ventrally yellow, dorsally fore and mid tarsi with yellow segments 1–4 and brown apical segment 5; hind tarsus brown dorsally.

WING. Translucent with yellow stigma and veins, completely microtrichose; vein Rs with short, black pile; M 1 meets R 4+ 5 in an acute angle. Calypter brownish with yellow fringe; haltere bright yellow.

ABDOMEN. Oval, in broadest part slightly broader than thorax at level of wing base, shiny-brown with short, erect, white pilosity, longer on sides of tergites I–II. Sternites shiny, yellow, with short semi-erect white pilosity.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 22. Cheilosia flavigena sp. nov., holotype, ♀ (CNC). A. Head, lateral view. B. Head, dorsal view. C. Antenna, lateral view of pedicel and basoflagellomere. D. Tip of wing. Scale bars indicated in drawings.

Fig. 23. Cheilosia flavigena sp. nov., holotype, ♀ (CNC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.