Cheilosia illustratoides, 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 : 56-59

Cheilosia illustratoides sp. nov.

urn:lsid:zoobank.org:act:B17C29CB-B7D4-40A2-B88B-30982EA2AE2B

Figs 29–30

Differential diagnosis

Cheilosia (Floccocheila) illustratoides sp. nov. is close to Cheilosia indistincta sp. nov. and C. vellea sp. nov., and from these species C. illustratoides differs by mostly long yellow pilosity of femora (vs predominantly black in C. indistincta sp. nov. and C. vellea sp. nov.), Cheilosia indistincta sp. nov. differs from C. vellea sp. nov. by having only yellow pilosity on lateral margin of tergite I (vs with black pilosity in C. vellea sp. nov.), all species differ by structure of male genitalia.

Etymology

The specific epithet ‘ illustratoides ’ is from the Latin ‘ illustrates ’, meaning ‘clear, enlightened’, referring to the resemblance of the new species with the Palearctic Cheilosia illustrata (Harris, 1780) .

Material examined

Holotype NEPAL • ♂; Westnepal , Distr. Bajura, Simikot, 19 km W of Kuwad Khola; 29°53′14″ N, 81°38′40″ E; 3500 m a.s.l.; 5 Jul. 2001; Creutzburg leg.; NME.

Paratypes NEPAL • 1 ♂; 21 Dolakha Distr., SW of Kalinchok Mt.; 3100 m a.s.l.; 19–23 Apr. 1995; Iglesias leg.; ZSMC • 1 ♀; Distr. Humla, 20 km NW of Simikot, 3.8 km SE of Chala; 29°58′49″ N, 81°38′23″ E; 3500 m a.s.l.; 27–28 Jun. 2001; Creutzburg leg.; juniper meadows; NME • 1 ♀; Westnepal, Distr. Humla, Simikot , 12 km S of Raya; 29°52′29″ N, 81°51′57″ E; 2400 m a.s.l.; 8 Jul. 2001; Creutzburg leg.; NME • 1 ♀; Prov. Karnali, Umg. Lager oberhalb Maharigaon [surroundings of camp above Maharigaon]; 29°20.24′ N, 82°23.21′ E; 3300–3400 m a.s.l.; 20 Jun. 1997; J. Weipert leg; IBSJW / NME .

Description

Male

LENGTH. Body 11–12.5 mm, wing 9–10 mm.

HEAD. Face in anterior view moderately broad, ventrally wider, black, almost completely covered with dense yellowish pollinosity, pollinosity denser in dorsal part of face; non-pilose (but with some distinct microtrichia latero-medially); facial tubercle small, not prominent; parafacia relatively broad, clearly broader than ½ width of basoflagellomere, grey pollinose along eye and shiny towards face, long yellow pilose in dorsal half and ventral half with mixed very long black and yellow pilosity. Gena broad, densely grey pollinose and long yellow pilose. Frons broad and convex, grey pollinose and long yellow and black pilose, laterally with short yellow pilosity; frontal angle obtuse; lunule brownish-yellow; antennal pits broadly separated. Antenna black; basoflagellomere blackish, grey pollinose, rounded; pedicel ventrally with some black and yellow pile as long as width of pedicel; arista narrow, long, black, with very short but distinct pilosity. Eye completely densely black pilose; eye contiguity longer than length of frons without lunule; eye ventrally with narrow orange spot. Vertex black, grey pollinose and long, black and yellow pilose; ocellar triangle isosceles. Occiput yellow pilose.

THORAX. Postpronotum black, grey pollinose, mixed black and yellow pilose. Scutum black, very finely punctured, mixed black and yellow pilose; whitish pollinose anterior to transverse suture, scutum with two short longitudinal vittae of grey pollinosity on anterior ¼; mainly black pilose on lateral parts posterior to transverse suture; postalar callus long yellow pilose and slightly grey pollinose; scutellum anteriorly narrowly grey pollinose, long yellow pilose and with some fine black shorter pile medially; scutellum margin lacking strong bristles, with long yellow and black pilosity of length up to length of scutellum. Subscutellar fringe long, dense, yellow. Pleura grey pollinose, with very long yellow pilosity; anterior anepisternum with slight pollinosity, non-pilose, posterior anepisternum without strong bristles, yellow pilose with a few black pile; katepisternum contiguously yellow pilose. Metasternum yellow pilose.

LEGS. Coxa black, grey pollinose and long yellow pilose, without baso-lateral spur; femora black with narrowly yellow tips, fore and mid femora ventrally with mixed long black and yellow pilosity, hind femur in basal ⅔ anteriorly with very long yellow pilosity and apically with shorter black pilosity, ventrally with very long yellow pilosity and short black pilosity; tibiae brownish yellow with broad black annulus medially which is incomplete dorsally; fore and hind tarsi dorsally black, mid tarsus with two basal segments yellowish and apical segments dark.

WING. Entirely microtrichose, slight brownish, veins yellowish brown; vein Rs with black and yellow pile in basal ⅔; M 1 meeting R 4+ 5 in an obtuse angle. Calypter yellowish with yellow fringe; haltere darkbrown with black knob.

ABDOMEN.Abdomen broad, about as broad as mesonotum at level of wing base, black, finely punctured, grey pollinose, with dense, long, erect pilosity; tergite I with yellow pilosity medially and laterally with orange pilosity, tergite II foxy-orange pilose, tergites III–IV foxy-orange pilose with black pilosity along lateral margin of tergite III, and sometimes with some black pile postero-laterally on tergite III. Sternites grey pollinose, long erect yellow pilose, sternites III and IV also with shorter, erect black pilosity.

Female

LENGTH. Body 11–11.5 mm, wing 9–10 mm.

HEAD. Face slightly pollinose, except shiny on lower mouth margin. Parafacia relatively broad, about ⅔ of width of basoflagellomere. Frons broad, anteriorly wider, shiny, antero-laterally grey pollinose, in anterior ⅓ with a transverse pollinose band; with long erect yellow and black pilosity; ldsateral furrows broad, medial furrow invisible. Antenna black; basoflagellomere blackish with postero-ventral margin indistinctly reddish-brown, grey pollinose, rounded.

THORAX. Postpronotum and notopleural area densely whitish-grey pollinose; notopleural area yellow pilose and with a few black pile.

ABDOMEN. Tergite I yellow pilose, tergite II with long reddish pilosity medially and laterally with long white pilosity, tergites III–IV foxy-orange pilose medially and laterally black pilose, tergite V foxyorange pilose. Sternite V medially with appressed black pile, laterally with semi-erect yellow pile. Other characters as in male.

Distribution

Nepal.

Figures

Fig. 29. Cheilosia (Floccocheila) illustratoides sp. nov.; A, C–G = holotype, ♂ (NME), B = paratype, ♀ (NME). A. Head, lateral view. B. Head, dorsal view. C. Antenna, lateral view of pedicel and basoflagellomere. D. Tip of wing. E. Aedeagus and aedeagal apodeme, lateral view. F. Surstylus and gonocercus, lateral view. G. Superior lobe of hypandrium, lateral view. Scale bars indicated in drawings.

Fig. 30. Cheilosia (Floccocheila) illustratoides sp. nov. A–B. Holotype, ♂ (NME); dorsal and lateral views. C–D. Paratype, ♀ (NME); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.