Cheilosia gilva, 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 : 47-52

Cheilosia gilva sp. nov.

urn:lsid:zoobank.org:act:A937C4FF-9377-4B0A-85B8-0A6FBA8C2523

Figs 24–26

Differential diagnosis

Cheilosia (Montanocheila) gilva sp. nov. differs from all members of subgenus Montanocheila by very unusual and distinct structure of male genitalia ( Fig. 24C–E ) and by presence of pilosity on face and eye, and lacking long, strong bristles on scutum and scutellum.

Etymology

The specific epithet is from the Latin ‘ gilvus ’, meaning ‘pale-yellow’ and refers to the yellowish pilosity.

Material examined

Holotype NEPAL • ♂; Solukhumbu Tragdobuk ; 27°34′ N, 86°31′ E; 3200– 3000 m a.s.l.; 11 May 97; Hauser leg. [513]; CSCA.

Paratypes NEPAL • 2 ♀♀; same data as for holotype; CSCA • 1 ♀; Solukhumbu Junbesi to Ringmo; 27°34′ N, 86°35′ E; 2700–3000 m a.s.l.; 12 May [19]97; M. Hauser leg. [515]; CSCA • 1 ♀; Ramechap Mohabir Khola E of Shivalaya; 27°35′ N, 86°19′ E; 2500–2600 m a.s.l.; 6– 7 May [19]97; Hauser leg.; CSCA • 1 ♂, 2 ♀♀; Solukhumbu above Nunthala; 27°35′ N, 86°38′ E; 2500– 2300 m a.s.l.; 13 May [19]97; Hauser leg. [517]; CSCA • 1 ♂; Solukhumbu above Pangum; 27°34′ N, 86°45′ E; 2900–3000 m a.s.l.; 16 May [19]97; M. Hauser leg. [522]; CSCA • 1 ♂; Solukhumbu , E of Pangkongma La; 27°34′ N, 86°45′ E; 3000 m a.s.l.; 17 May 1997; M. Hauser leg. [523]; CSCA • 1 ♀; 27°57′ N, 84°59′ E; 10 100 ft a.s.l.; 25 May 1967; Can. Nepal Exped.; Malaise trap; CNC • 1 ♀; 28°00′ N, 85°00′ E; 9900 ft a.s.l.; 26 May 1967; Can. Nepal Exped.; Malaise trap; CNC • 1 ♂; Prov. Bagmati Langtang-Himal, Rimche to Ghora Tabela; 2500–3000 m a.s.l.; 12 Apr. 2004; J. Weipert leg.; “KF”; IBSJW / NME • 1 ♂; Prov. Mahakali, Shine bis Lager am Chamliya Khola bei Batar [Shine to camp on Chamliya Khola near Batar]; 2000 m a.s.l.; 11 Jun. 2005; J. Weipert leg.; IBSJW / NME • 1 ♀; Prov. Karnali, Hochtal Gothichaur [Gothichaur valley]; 29°12.10′ N, 82°18.56′ E; 2900 m a.s.l.; 9 Jun. 1997; J. Weipert leg.; IBSJW / NME .

Description

Male

LENGTH. Body 7.5–8.6 mm, wing 7.0– 8.5 mm.

HEAD. Face in anterior view broad, black, grey pollinose, except tip of facial tubercle shiny non-pollinose; with long, scattered yellow and black pilosity; facial tubercle distinct but small; parafacia moderate in width, in broadest part nearly equal to basoflagellomere width, densely grey pollinose and long yellow pilose (sometimes also with some black pilosity intermixed), length of longest pile longer than eye pilosity; gena comparatively broad, grey pollinose and long yellow pilose. Lower part of occiput broad, densely covered with white pollinosity and whitish or yellowish pilosity. Frons slightly inflated, broad, densely grey pollinose and long yellow pilose; frontal angle slightly obtuse; lunule dark-brown, antennal pits distinctly separated. Scape and pedicel black shiny, basoflagellomere roundish, dusky orange and slightly whitish pollinose; arista long, black, bare. Eye with long, dense, yellow and some black pilosity; eye contiguity approximately equal to length of frons without lunule. Vertex slightly inflated, covered with long yellow pilosity; ocellar triangle equilateral. Occiput with long yellow and some long black pilosity, and short yellow pilosity.

THORAX. Postpronotum black, grey pollinose with yellow pilosity. Scutum finely punctured, shinyblack, with whitish-grey pollinosity on notopleural area and narrowly along anterior margin; with dense, long, erect yellow pilosity of approximately equal length, mixed with erect black pilosity laterally and posteriorly, lacking strong bristles anterior or posterior to transverse suture an on postalar callus. Scutellum shiny-black, with dense, long, black pilosity, and shorter yellow pilosity on anterior margin, hind margin lacking strong bristles. Subscutellar fringe pilosity long, pale-yellow. Pleura densely whitishgrey pollinose and long, dense, yellow pilose; anepisternum postero-dorsally also with patch of black pilosity; dorsal and ventral pile patches on katepisternum narrowly connected anteriorly; metasternum with long yellow pilosity.

LEGS. Fore coxa without baso-lateral spur; coxa dark-brown or black with dense whitish pollinosity and comparatively long yellow pilosity; femora black with tips narrowly yellow; fore and mid tibia yellow with more or less well developed black annulus medially, hind tibia slightly curved, yellow in basal ⅓ and on tip and black otherwise; tarsi of fore and mid legs with yellowish basal segments 1–4 and last segment dorsally dark, hind tarsi dorsally blackish; long pilosity on posterior part of fore and mid femora yellow in basal half and black in apical half; ventral side of hind femur with long yellow pilosity, longest pile up to 1.5× width of hind femur.

WING. Brownish infuscated (sometimes slightly yellow in basal ⅓), veins yellow or brownish, cross-veins brownish infuscated and sometimes with brownish weakly infuscated brown patch medially, completely covered with microtrichia, Rs with some black pile in basal ⅔, inner angle between veins M 1 and R 4+5 right. Calypter yellow with yellow fringe; haltere yellow with dark-brown to blackish knob.

ABDOMEN. Black, oval, broad, in broadest part broader than scutum at level of wing base, shiny with yellowish pilosity, lateral sides of tergites I–II with dense, much longer, white and orange-yellow pilosity, tergite III with some appressed black pilosity postero-laterally, tergite IV with appressed black pilosity along posterior margin. Sternites densely grey pollinose and long yellow pilose.

Female

LENGTH. Body 8.4–9.1 mm, wing 7.4–8.1 mm.

HEAD. Frons comparatively narrow with distinct, grey pollinose lateral furrows, on anterior ⅓ with a transverse, narrow stripe of grey pollinosity, pilosity comparatively short, erect, yellow. Lunule bright yellowish or orange. Basoflagellomere orange-brown, somewhat bigger than in male, slightly darkened anteriorly.

THORAX. Scutum with moderately long, erect, yellow pilosity, with some black pilosity intermixed on posterior half, scutellum with yellow pilosity, and some black pilosity on disc, hind margin with yellow pilosity, some of which are longer.

LEGS. Fore and mid femora with only yellow pilosity on posterior part; yellow pilosity on ventral part of hind femur relatively short but at most equal to width of femur; tibia completely bright yellow, only hind tibia with indistinct brownish stripe dorsally, colour of tarsi as in male but the yellow colour is brighter.

ABDOMEN. Broadly oval, shiny with bluish reflection, tergite I with grey pollinosity; pilosity as in male, but slightly shorter.

Distribution

Nepal.

Figures

Fig. 24. Cheilosia (Montanocheila) gilva sp. nov., holotype, ♂ (CSCA). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Aedeagus and aedeagal apodeme, lateral view. D. Superior lobe of hypandrium, lateral view. E. Surstylus and gonocercus, lateral view. Scale bars indicated in drawings.

Fig. 25. Cheilosia (Montanocheila) gilva sp. nov., paratype, ♀ (CSCA). A. Head, dorsal view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing. D. Head, lateral view. Scale bars indicated in drawings.

Fig. 26. Cheilosia (Montanocheila) gilva sp. nov. A–B. Holotype, ♂ (CSCA); dorsal and lateral views. C–D. Paratype, ♀ (CSCA); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.