Cheilosia weiperti, 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 : 119-124

Cheilosia weiperti sp. nov.

urn:lsid:zoobank.org:act:E4CBFF26-737D-426B-A5BF-01901712553E

Figs 66–67

Differential diagnosis

Cheilosia (Cheilosia) weiperti sp. nov. is a slender, comparatively short species, with moderately long and dense pilosity, with a typical structure shared by taxa of Cheilosa s. str. of the distiphallus (apical sclerite of the aedeagus-complex). Cheilosia (C.) weiperti sp. nov. differs from all species of Cheilosia by set of the following characters: face protruded with facial tubercle in lower part, facial tubercle of distinct shape, scutellum with long, black, bristle-like pile (much longer than length of scutellum), antennae black, mesonotum black, fore coxa without baso-lateral spur. The species has a very pronounced sexual dimorphism, especially in colour of the legs. A similar shape of face, wing venation, and occurrence of males and females simultaneously at the same locality lends support to their conspecificity. Cheilosia weiperti sp. nov. is most similar to C. suspecta Barkalov & Cheng, 2004 ( Fig. 62 ), and can be differentiated by characteristic shape of superior lobe.

Etymology

The species is named after and in honour of Dr Jörg Weipert (Plaue, Germany), who collected an impressive amount of Cheilosia spp. in Nepal and allowed us to study the material.

Material examined

Holotype NEPAL • ♂; Prov. Mahakali, Shinae bis Hochebene vor Api bei Sare Duru [Shinae to plateau before Api near Sare Duru] ; 3400– 2800 m a.s.l.; 7 Jun. 2005; J. Weipert leg; BSJW / NME.

Paratypes NEPAL • 19 ♂♂, 12 ♀♀; same data as for holotype; BSJW / NME • 9 ♂♂, 15 ♀♀; Prov. Mahakali, Lager an Chamliya Khola bei Shinae [camp at Chamliya Khola near Shinae] ; 29°53′35″ N, 80°56′30″ E; 2800 m a.s.l.; 6–10 Jun. 2005; J. Weipert leg.; BSJW / NME • 17 ♂♂, 6 ♀♀; Prov. Mahakali, Hochlager vor Api bis Lager an Chamliya Khola bei Shinae [camp before Api to camp at Chamliya Khola near Shinae] ; 3400– 2800 m a.s.l.; 10 Jun. 2005; J. Weipert leg.; BSJW / NME • 1 ♂, 1 ♀; Prov. Mahakali, Hochlager vor Api bis Lager an Chamliya Khola bei Batar [camp before Api to camp at Chamliya Khola near Batar] ; 2000 m a.s.l.; 11 Jun. 2005; J. Weipert leg.; BSJW / NME .

Description

Male

LENGTH. Body 6.5–7.3 mm, wing 8–9 mm.

HEAD. Face in anterior view narrow, in lateral view forwardly protruded; black, grey pollinose except shiny facial tubercle and areas around mouth margin; non-pilose; facial tubercle in lower part of face, not distinct, in lateral view gradually sloping; parafacia moderate in width, in broadest part almost equal to basoflagellomere width, densely grey pollinose and very short, white pilose; gena narrow, grey pollinose and short yellow pilose. Frons somewhat inflated, densely brown pollinose and black pilose; lunule brown, antennal pits broadly separated. Antenna black, basoflagellomere rounded, with dense brown pollinosity; arista long, black with very short pilosity; antennal pits separated. Eye completely covered with short, not dense pale pilosity; eye contiguity longer than length of frons without lunule. Vertex inflated with long, black pilosity, ocellar triangle equilateral. Occiput with long black and short yellow pilosity.

THORAX. Postpronotum black with paler posterior margin, densely greyish-yellowish pollinose and black pilose. Scutum fine-punctured, black, with bluish reflection, with slight grey-brown pollinosity; pilosity black, erect short and 2–3× longer black pilosity, in posterior part pilosity distinctly longer, in anterior part also with some short yellow semi-erect pilosity; scutum laterally with some long black bristles; postalar callus with a few very strong black bristles; scutellum black pilose, hind margin with black pilosity longer than scutellum length. Subscutellar fringe long, dense yellow. Pleura black, with bluish reflection, grey pollinose and pilosity mixed black and yellow; anepisternum postero-dorsally with long and strong black bristles; katepisternum with dorsal and ventral pile patches widely separated; metasternum with some long yellow pilosity.

LEGS. Mainly black; fore coxa without baso-lateral spur; coxae brown or black, grey pollinose and yellow pilose; trochanter brown or pale brown; femora basally and in apical ⅓ brown; basal half of tibia and tips sometimes brownish; fore femur with posterior long pilosity black, mid femur with posterior pilosity black and yellow, hind femur with ventral pilosity black and yellow; all tarsi black, hind metatarsus very long, as long as or longer than total length of other tarsal segments.

WING. Long and narrow, slightly brownish, completely covered with microtrichia, inner angle of M 1 and R 4+5 right, vein Rs with a few short black pile. Haltere and calypter bright yellow.

ABDOMEN. Elongate, in broadest part distinctly narrower than mesonotum at level of wing base, shiny black with bluish reflection laterally and on all of tergites I and IV, with dense brown pollinosity medially on tergites I–III, laterally shiny parts form large maculae; long yellow pilose, and some black pilosity on posterior part of tergite IV. Sternites shiny but slightly yellowish pollinose; long yellow pilose, sternite IV also with short, appressed black pilosity.

Female

LENGTH. Body 6–7 mm, wing 8–8.5 mm.

HEAD. Face very narrow, in anterior view parallel-sided; parafacia black dorsally and blackish-brown or yellow ventrally, covered with slight pollinosity and very short (microtrichia-like) white pilosity; gena narrow, brown to black with whitish pollinosity and short, scattered yellow pilosity. Frons narrow, slightly broadened anteriorly, black, sometimes brownish near eye, with two longitudinal furrows, a medial furrow only visible at antennal base, shiny with spots of grey pollinosity at antero-lateral corners, covered with short semi-appressed yellow and scattered longer black, erect pilosity. Antenna with basoflagellomere slightly bigger than in male, black with dense brown pollinosity; arista long with distinct pilosity. Eye with very short white pilosity only visible under high magnification, length of pile 1–2× ommatidia width.

THORAX. Postpronotum black to yellow. Scutum black with bluish reflection, with dense brown pollinosity in anterior part, anteriorly with short appressed, yellow pilosity, otherwise with black short, appressed and semi-erect pilosity, laterally also with strong, long black bristles. Scutellum with short, mostly black pilosity mixed with some yellow pilosity, hind margin with two long and strong bristles, in addition to some shorter, less strong black bristles.

LEGS. Yellow, except tarsi dorsally variably blackish to brownish.

ABDOMEN. Black, narrow, tergites I–III slightly pollinose but shiny, tergites IV–V more densely pollinose; tergite I sometimes with small yellow maculae on antero-lateral corners, and tergite III with narrow yellow fasciae antero-laterally; sternites with slight pollinosity, and with yellow, adpressed pilosity. In other characters as the male.

Distribution

Nepal.

Figures

Fig. 66. Cheilosia (Cheilosia) weiperti sp. nov.; A–C, F–H = holotype, ♂ (BSJW/NME), D–E = paratype ♀ (BSJW/NME). A, D. Head, lateral view. B, E. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing (bent arrow?). F. Aedeagus and aedeagal apodeme, lateral view. G. Superior lobe of hypandrium, lateral view. H. Surstylus and gonocercus, lateral view. Scale bars indicated in drawings.

Fig. 67. Cheilosia (Cheilosia) weiperti sp. nov. A–B. Holotype, ♂ (BSJW/NME); dorsal and lateral views. C–D. Paratype, ♀ (BSJW/NME); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.

Fig. 62. Cheilosia (Cheilosia) suspecta Barkalov & Cheng, 2004. A. Male head, lateral view. B. Female head, anterior view. C. Aedeagus and aedeagal apodeme, lateral view. D. Superior lobe of hypandrium, lateral view. E. Basoflagellomere, lateral view. F. Tip of wing. G. Surstylus and gonocercus, lateral view. After Barkalov & Cheng 2004. Scale bars indicated in drawings.