Cheilosia versa, 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 : 116-119

Cheilosia versa sp. nov.

urn:lsid:zoobank.org:act:2401A5B9-558E-4899-B5C2-80CD1115E9F0

Figs 64C–E , 65

Differential diagnosis

Cheilosia versa sp. nov. is morphologically similar to C. flavigena sp. nov., but differs by having yellow pilosity on mesonotum (vs yellow and black in C. flavigena sp. nov.), presence of pilosity also on ventral part of face (vs only latero-dorsally in C. flavigena sp. nov.), basoflagellomere smaller and distinctly darkened antero-dorsally (vs larger in size and completely orange in C. flavigena sp. nov.), and bristles on scutellum margin shorter than length of scutellum (vs longer or almost as long in C. flavigena sp. nov.).

Cheilosia versa sp. nov. is also similar to Cheilosia (Neocheilosia) komabaensis Shiraki, 1968 (see figs in Barkalov & Ichige 2016), both species have longer pile latero-dorsally on the face, but C. versa sp. nov. differs by having pilosity in lower part of face and yellow maculae laterally on frons, and parafacia yellow pollinose. A subgeneric classification is not proposed as the taxon is described based on a single female.

Etymology

The specific epithet is from the Latin, meaning ‘with the order changed’ or ‘with the relations reversed’, referring to the unclear infrageneric placement.

Material examined

Holotype NEPAL • ♀; Ktmd. [Kathmandu], Godavari ; 6000 ft a.s.l.; 12 Aug. 1967; Can. Nepal Exped.; CNC.

Description

Female

LENGTH. Body 6.7 mm, wing 7.0 mm.

HEAD. Face moderately broad, with parallel sides, shiny black, laterally and under antenna finely grey pollinose, and with short black pilosity on ventral half; facial knob broad, roundish, not very prominent; parafacia narrow, in broadest part almost equal half of basoflagellomere width, brownish and velvety silvery pollinose and with short, scattered white pilosity; gena narrow, black, finely grey pollinose with comparatively short white pilosity. Frons moderately broad, distinctly narrowed posteriorly, anterior ⅓ inflated, shiny, with distinct transversal stripe of grey pollinosity, and elongated spots of brownish pollinosity near eyes; mid furrow developed on anterior inflated part, invisible in posterior part; covered with short pale pilosity. Lunule yellow, antennal pits distinctly separated. Antenna yellow, antero-dorsal margin of basoflagellomere distinctly darkened; basoflagellomere oval, moderate in size, arista long, black, with very short pilosity. Eye with very short, scattered white pilosity (visible under high magnification). Ocellar triangle equilateral, shiny, covered with short black pilosity. Occiput shiny, pilosity mainly white, intermixed with some black pile.

THORAX. Postpronotum brownish, shiny with short white pilosity. Scutum and scutellum, finely punctured, matte, anterior part of scutum with two longitudinal medial grey stripes extending about ⅔ of length of scutum, with short, semi-erect, yellow pilosity; scutum posterior of transverse suture laterally with a few black bristles; postalar callus with one fine black bristle; scutellum hind margin with six distinct black bristles, all shorter than length of scutellum. Subscutellar fringe short, yellow. Pleura brownish-black, finely grey pollinose and short white pilose; anterior anepisternum without longer pilosity, katepisternum largely covered with white pilosity except on anterior part; metasternum with short white pilosity.

LEGS. Coxae brownish-black with grey pollinose and white pilosity, fore coxa without baso-lateral spur; femora black with extreme tips yellow, covered with short yellow pilosity; tibia with yellow basal ⅓–½ and tips and blackish otherwise; fore and hind tarsi black dorsally, mid tarsus with segments 1–3 of yellowish-brown and segments 4–5 brownish-black.

WING. Hyaline with yellow veins, completely microtrichose, Rs without short pile, inner angle between veins M

1

and R

4+5

right. Calypter white with yellow fringe, haltere yellow.

ABDOMEN. Oval, in broadest part distinctly broader than scutum at level of wing base; brownish-black, paler in colour medially, shiny, but completely covered with fine brown pollinosity with more or less indistinct patches of denser pollinosity laterally on tergites I–III; tergites II–III with erect, yellow short pilosity on lateral parts, and adpressed and semi-adpressed short black pilosity medially, tergites I and IV completely with short erect yellow pilosity. Sternites brownish, grey pollinose, with short yellow pilosity, posterior margin of sternite IV with a few black pile.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 64. A–B. Cheilosia (Floccocheila) vellea sp. nov., holotype ♂ (BSJW/NME); dorsal and lateral view. – C–E. Cheilosia versa sp. nov., holotype, ♀ (CNC); dorsal and lateral views. Scale bars: A–D = 1 mm; E = 0.5 mm.

Fig. 65. Cheilosia versa sp. nov., holotype, ♀ (CNC). A. Head, lateral view. B. Tip of wing. Scale bars indicated in drawings..