Cheilosia crassata, 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 : 29-32

Cheilosia crassata sp. nov.

urn:lsid:zoobank.org:act:03BBE705-646B-4DBE-81F8-2BD9F1FCA027

Figs 11–12

Differential diagnosis

Cheilosia (Floccocheila) crassata sp. nov. is more robust but otherwise similar to the Palearctic species Cheilosia (F.) illustrata (Harris, 1780) . Cheilosia (F.) crassata sp. nov. can be discerned from all other members of subgenus Floccocheila by the distinctly protruded face.

Etymology

The specific epithet is from the Latin ‘ crassus ’ meaning ‘stout’, referring to the robust habitus of the species.

Material examined

Holotype NEPAL • ♂; Prov. Nr. 3 East, Dingpoche ; 4400 m a.s.l.; 3 Jun. 1964; W. Dierl leg.; ZSMC.

Paratypes NEPAL • 1 ♂; Prov. Nr. 3 East, Chukhung; 4800–5000 m a.s.l.; 8 Jun. 1964; W. Dierl leg.; ZSMC • 1 ♂; same data as for holotype; ZSMC • 1 ♀; Khumbu , Lobuche; 4900 m a.s.l.; 5 Jul. 1962; G. Ebert and H. Falkner leg.; ZSMC .

Description

Male

LENGTH. Body 9.3–12.6 mm, wing 8.8–10.6 mm.

HEAD. Face in anterior view slightly broadened ventrally, in lateral view distinctly protruded, black, silvery pollinose except on extreme tip of facial tubercle and a broad shiny stripe extending from parafacia to lower oral margin; non-pilose. Facial tubercle in lateral view moderately protruding; gena relatively broad, densely, silvery pollinose and long, white pilose, with some black pilosity anteriorly. Parafacia broad, nearly as broad as basoflagellomere width (ca ⅘ of width); shiny, with some pollinosity in ventral part; long, white pilose in dorsal part and black pilose in ventral part, pilosity longer than eye pile. Frons moderately inflated, densely, long, silvery pollinose; white pilose mixed with some black pile anterolaterally. Frontal angle distinctly obtuse. Lunule bright yellow, antennal pits broadly separated. Scape and pedicel yellowish-brown, basoflagellomere comparatively big, rounded or with slightly developed antero-dorsal angle, bright-orange with anterior and dorsal margin slightly dark-brown; arista long, black, bare. Eye entirely long, dense, black pilose; length of eye contiguity slightly shorter than length of frons without lunule. Vertex somewhat inflated with long white pilosity, ocellar triangle isosceles. Occiput with long and short white pilosity.

THORAX. Postpronotum black with brown anterior margin, white pilose. Scutum black with blue reflections, fine-punctured; with four longitudinal stripes of grey-brown pollinosity not reaching scutum hind margin; with long, dense, erect pilosity of same length, white on anterior parts and near scutellum, mixed with black pilosity on medial and lateral parts; postalar callus mostly white pilose mixed with a few black pile, scutum and postalar callus lacking strong bristles; scutellum shiny with bluish reflection, long, densely white pilose, scutellar margin lacking strong bristles. Subscutellar fringe with long, dense, white pilosity. Pleura predominantly black pilose; antero-dorsal corner of anepisternum, antero-dorsal corner of katepisternum and all area from wingbase to base of mid coxa brown in colour; with long, dense, erect pilosity, white on posterior parts of anepisternum, katepisternum and anepimeron, pilosity otherwise black; pilosity on katepisternum confluent; metasternum black pilose.

LEGS. Fore coxa brown, without baso-lateral spur, white pollinose and black pilose; femora black with tips more or less yellow, long pilosity on posterior part of fore and mid femur and antero-ventral part of hind femur black, hind femur with numerous long, black pile on anterior and antero-dorsal part; fore and mid tibia orange-yellow with more of less developed black annulus medially, hind tibia with yellowbrownish basal third and tip, otherwise black; tarsi bright orange ventrally, dorsally fore and hind tarsi black, mid tarsi yellow except for fifth segment darkbrown or black.

WING. Slightly brownish along transversal veins, entirely microtrichose, Rs with some yellow pilosity; inner angle between veins M 1 and R 4+5 right. Haltere yellow with black knob; calypter greyish-white with brownish rim and white fringe.

ABDOMEN. Broad, oval, in its broadest part approximately equal to scutum width at level of wing base, black with bluish reflection on tergites I–II; covered with dense, erect, long pilosity, white on tergites I–II and bright orange in other parts. Sternites pollinose, with erect, black pilosity, longest on sternites II–III, sternite IV with semi-appressed black pilosity.

Female

Unknown.

Distribution

Nepal.

Figures

Fig. 11. Cheilosia (Floccocheila) crassata sp. nov., holotype, ♂ (ZSMC). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing. D. Surstylus and gonocercus, lateral view. E. Aedeagus and aedeagal apodeme, lateral view. F. Superior lobe of hypandrium, lateral view. Scale bars indicated in drawings.

Fig. 12. Cheilosia (Floccocheila) crassata sp. nov. A–B. Holotype, ♂ (ZSMC); dorsal and lateral views. C–E. Paratype, ♂ (ZSMC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.