Cheilosia hauseri, 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 : 52-55

Cheilosia hauseri sp. nov.

urn:lsid:zoobank.org:act:19D0A546-2513-4BA2-B2DC-66B0A8964947

Figs 27–28

Differential diagnosis

Cheilosia (Cheilosia) hauseri sp. nov. shares the following characters with other members of Cheilosia s. str.: antennal pits broadly separated, eye densely pilose, body pilosity not long and dense, body not bumble-bee like, and structural similarity of male genitalia. Cheilosia hauseri sp. nov. differs from other congeners by the unusual structure of the facial tubercle in combination with the colouration of femora.

Etymology

The new species is named after and in honour of Dr Martin Hauser, who collected an impressive amount of Syrphidae in Nepal and allowed us to study the Cheilosia material.

Material examined

Holotype NEPAL • ♂ (genitalia prepared and stored in vial on same pin); Solukhumbu , above Gudel; 27°29′ N, 86°51′ E; 2000–2500 m a.s.l.; 22 May 1997; Hauser leg. [531]; CSCA.

Paratypes NEPAL • 1 ♀; same data as for holotype; CSCA • 3 ♂♂ (genitalia prepared and stored in vial on same pin); Solukhumbu , Sanam; 27°27′ N, 86°53′ E; 2700–2800 m a.s.l.; 22–23 May 1997; Hauser leg. [532]; CSCA • 1 ♀; Solukhumbu , Nashing Dingma, W. Surike La; 2700 m a.s.l.; 20 May 1997; Hauser leg. [526]; CSCA • 7 ♀♀; 28°00′ N, 85°00′ E; 9900 ft a.s.l.; 1 Jun. 1967; Can. Nepal Exped.; Malaise trap 7; CNC • 3 ♂♂; same data as for preceding; Can. Nepal Exped.; CNC • 4 ♂♂; 28°00′ N, 85°00′ E; 10 500 ft a.s.l.; 1 Jun. 1967; Can. Nepal Exped.; Malaise trap 6; CNC • 1 ♀; same data as for preceding; Can. Nepal Exped.; CNC • 1 ♂, 1 ♀; 27°58′ N, 85°00′ E; 10 500 ft a.s.l.; 26 May 1967; Can. Nepal Exped.; Malaise trap 6; CNC • 4 ♀♀; 28°00′ N, 85°00′ E; 9900 ft a.s.l.; 26 May 1967; Can. Nepal Exped.; Malaise trap 7; CNC .

Description

Male

LENGTH. Body 8.0– 9.5 mm, wing 9.0– 9.7 mm.

HEAD. Face moderately protruded, black, bare, except tip of facial tubercle and anterior mouth margin grey pollinose, non-pilose; facial tubercle dorso-ventrally elongated and laterally appressed; parafacia moderate in width, dark-brown, densely silvery pollinose, with short, semi-erect white pilosity; gena narrow, grey pollinose, with comparatively short white pilosity; lower part of occiput with dense white pilosity. Frons slightly inflated, shiny but thinly pollinose, with narrow stripes of denser grey pollinosity along eye, black pilose; frontal angle acute (but close to right). Lunule yellowish to brown, antennal pits broadly separated. Scape and pedicel brown, basoflagellomere oval, orange; arista long, narrow, yellow, with very short pilosity. Eye with comparatively long, dense, yellow pilosity; length of eye contiguity longer than length of frons without lunule. Vertex slightly inflated, long black pilose; ocellar triangle equilateral. Dorsal part of occiput very narrow, with long black and short yellow pilosity.

THORAX. Postpronotum black, densely greyish pollinose, yellow pilose. Scutum shiny black, matt antero-laterally in front of transverse suture and narrowly anterior to scutellum; fine-punctured, with comparatively long, erect yellow pilosity medially and black pilosity laterally, posteriorly with some long black pilosity; postalar callus with very long black bristles and shorter yellowish pilosity; scutellum shiny but thinly pollinose, with short yellow and long black erect pilosity, hind margin shiny with many long black bristles (some longer than length of scutellum); subscutellar fringe long yellow. Pleura shiny, finely pollinose and yellow pilose, anepimeron dorso-posteriorly with some black pilosity; katepisternum with dorsal and ventral pile patches broadly separated; metasternum yellow pilose.

LEGS. Fore coxa without baso-lateral spur, light-brown, mid and hind coxae black; trochanters yellow; femora narrowly yellow basally, dark-brown to blackish, tips yellow posteriorly and with yellow stripe in apical ⅓–½ anteriorly; long pilosity on posterior surface of fore and mid femora yellow in basal part and black in apical part, long pilosity antero-ventrally on hind femur yellow, in apical half ventrally with short, black, strong pile; tibiae yellow with black annulus medially, bigger on hind tibia, hind tibia with some black pile longer than width of tibia antero-medially; tarsi mostly black, fore and mid metatarsus yellow.

WING. Basally yellowish, veins brown, completely covered with microtrichia; Rs with a few pile or lacking pile; vein M 1 meeting vein R 4+5 almost perpendicularly. Calypter white, with yellow rim and pilosity. Haltere yellow, with brown spot on knob, knob ventrally with short yellow pile.

ABDOMEN. Narrow, in broadest part distinctly narrower than scutum at level of wing base, black, brownish pollinose medially and shiny laterally, on tergites II and III pollinosity more dense in large, indistinct macula laterally; yellow pilose, long, erect on tergites I–II and on sides of tergites III–IV, and semiappressed medially on tergites III–IV. Sternites shiny but completely, thinly pollinose, sternites I–II with long erect yellow pilosity, sternites III–IV with shorter, semi-appressed, yellow pilosity.

Female

LENGTH. Body 7.3–8.8 mm, wing 8.0– 9.3 mm.

HEAD. Face more protruded forward than in male; facial tubercle of same shape but more prominent. Eye margin orange, densely silvery pollinose, with short, semi-appressed, white pilosity. Frons narrow, slightly broadened anteriorly; lateral furrows distinct and dulled by integumental rugosity and some erect pale pilosity, medial furrow invisible, but anterior to transverse furrow visible, distinct transverse furrow in anterior part of frons; shiny without pollinosity, covered with short, semi-appressed white pilosity, ocellar triangle equilateral. Lunule bright yellow, antennae completely yellow, basoflagellomere slightly bigger than in male.

THORAX. Scutum black, shiny with bluish sheen, with distinct but fine puncturation, with short semiappressed white pilosity; postalar callus anteriorly and posteriorly yellow, with two black bristles; scutellum hind margin with comparatively strong black bristles shorter than length of scutellum.

LEGS.Yellow but hind femur sometimes darker; hind femur in apical part ventrally with some short, black, strong pile; the three apical segments of fore and mid tarsi and dorsal surface of hind tarsus all black.

ABDOMEN. Slightly broader than mesonotum, shiny black, without pollinosity, with short, erect and semierect white pilosity, on sides of tergites I–II with longer pilosity.

Otherwise as the male.

Distribution

Nepal.

Figures

Fig. 27. Cheilosia (Cheilosia) hauseri sp. nov.; A–B, E–H = holotype, ♂ (CSCA), C–D = paratype, ♀ (CNC). A. Head, lateral view. B, D. Antenna, lateral view of pedicel and basoflagellomere. C. Head, dorsal view. E. Tip of wing. F. Superior lobe of hypandrium, lateral view. G. Surstylus and gonocercus, lateral view. H. Aedeagus and aedeagal apodeme, lateral view. Scale bars indicated in drawings.

Fig. 28. Cheilosia (Cheilosia) hauseri sp. nov. A–B. Holotype, ♂ (CSCA); dorsal and lateral views. C–D. Paratype, ♀ (CNC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.