Cheilosia spuria, 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 : 109-112

Cheilosia spuria sp. nov.

urn:lsid:zoobank.org:act:8E2D1070-F708-46DC-9C43-8A80EEC744E5

Figs 60–61

Differential diagnosis

For characters distinguishing Cheilosia (Cheilosia) spuria sp. nov. from congenerics, see the identification key, and Differential diagnosis under C. (C.) spinosa sp. nov.

Etymology

‘ Spurius ʼ is a Latin praenomen (personal name), with feminine form ‘ spuria ʼ, used during the period of the Roman Republic.

Material examined

Holotype NEPAL • ♂; Solukhumbu , Shibuche; 27°34′ N, 86°46′ E; 2700– 2300 m a.s.l.; 8 May 1997; M. Hauser leg. [524]; CSCA.

Paratypes NEPAL • 1 ♂; 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 1997; M. Hauser leg. [515]; CSCA • 1 ♀; Solukhumbu , E of Pangkongma; 27°34′ N, 86°45′ E; 3000 m a.s.l.; 17 May 1997; M. Hauser leg. [523]; CSCA • 1 ♂; same data as for preceding; labcode MZH _ G412 ; CSCA • 2 ♂♂, 1 ♀; Solukhumbu, Sanam ; 27°27′ N, 86°53′ E; 2700–2800 m a.s.l.; 22–23 May 1997; M. Hauser leg. [532]; CSCA • 1 ♂; Gandaki, Deng ; 13 May 2013; J. Weipert leg.; labcode MZH _ Y2505 ; IBSJW / NME .

Male

LENGTH. Body 6.8–8.8 mm, wing 7.5–8.2.

HEAD. Face bare, non-pilose, black, yellowish-grey pollinose, except facial tubercle and a small stripe at upper mouth edge shining, extreme tip of lower mouth edge also shining. Facial tubercle slightly laterally compressed, slightly more protruding than lower mouth edge. Face (frontal view) slightly divergent from level of antennal implantation to lower mouth edge; parafacia moderately broad, about ⅔ of width of basoflagellomere, slightly grey pollinose, with moderately long, pale, apically decumbent pile. Frontal angle nearly right, black, slightly grey pollinose, especially laterally, median sulcus present or reduced to a small pit above frontal lunule, lunule dark yellow-brown to black, shining, antennal pits separated, vertical triangle black with long black pile, occiput black, only slightly pollinose dorsally, narrow stripe at vertical triangle shiny, sides heavily grey pollinose, occiput dorsally predominantly with long black pile with single pale pile intermixed; eye contiguity about 1.5× as long as length of frons without lunule; eye with moderately long yellowish-grey pilosity, sometimes pilosity a little brownish dorsally; antenna black to blackish brown, pedicel apically with black pile dorsally and pale golden pile ventrally, basoflagellomere slightly longer than wide; arista black, bare.

THORAX. Scutum black, finely puncturated, anterior one fifth and lateral parts in front of transverse suture slightly grey dusted, predominantly with long erect pale golden pilosity with intermixed scattered black pile of approximately same length, especially lateraly anterior to transverse suture and anterior to scutellum, many bristly black pile laterally along wing base; scutellum shining black, occasionally base small grey pollinose, predominantly covered in long black pile, with pale pile intermixed to varying extent, hind margin with very many long black bristly pile; pleura black, completely and finely grey pollinose, with fine yellowish-grey pilosity, except some long black bristly pile on postero-dorsal corner of anepisternum, and occasionally single black pile on antero-dorsal corner of anepimeron, katepisternum completely pilose (upper and lower pile patches connected). Metasternum with white pilosity.

LEGS. Fore coxa baso-laterally with a distinct spur; all coxa completely grey pollinose. Legs predominantly black, except extreme tip of fore and mid femur, basal ⅓ and tip of fore ibia, basal ⅖ and tip of mid tibia, basal ¼ of hind tibia, and mid basitarsus obscurely yellowish-brown (colour of legs variable); colour of pilosity variable, predominantly pale, except long whitish pilosity mixed with long black hairs posteriorly on apical ⅔ of fore femur, some long black hairs dorsally on hind tibia and hind femur ventrally with short black pile in apical ⅓.

WING. Hyaline, completely microtrichose, with blackish veins. Inner angle between M 1 and R 4+5 nearly right. Calypter whitish with blackish rim; haltere pale brown with black knob.

ABDOMEN. Long oval; black; tergite I pale pollinose, tergites II–III slightly brownish pollinose on disc if viewed obliquely in anterior view, extreme hind margins of tergites and lateral margins shiny, tergite IV predominantly shiny, pregenital segments grey pollinose; tergites I–II predominantey pale pilose, except single black pile on the posterior corners of tergite II, tergite III with anterior margin and lateral margins with erect pale pilosity, medially and on hind margin with black adpressed pilosity, tergite IV predominantly black pilose, anteriorly and laterally with erect pale pile, black pilosity adpressed medially, but long and erect on posterior corners; pregenital segments black pilose. Sternites predominantly grey pollinose and pale pilose, except posterior half of sternite IV which is more and less shiny with adpressed black pilosity.

MALE GENITALIA. Gonostylus distinct, with only the left process developed.

Female

LENGTH. Body 7–8.2 mm, wing 6.5–8.0.

HEAD. Frons narrow, at level of antennal base about three times as wide as basoflagellomere, with fine pilosity and with narrow lateral furrows, without median furrow, but with a more or less distinct pit just above frontal lunule, lateral furrows grey dusted in anterior ¼, with a shallow transverse furrow posterior to lunule; pilosity of frons variable, from almost all black to almost all pale; occiput dorsally black shining; lunule may be paler, scape and pedicel reddish brown, basoflagellomere dark-brown and sometimes reddish postero-ventrally, larger than in male.

THORAX. Predominantly with erect pale pile, shorter than diameter of hind femur.

LEGS. Paler than in male, mid trochanter partly yellow. Calypter whitish with yellow-orange rim; haltere yellowish

ABDOMEN. More shiny than in male, with less black pilosity; sternites slightly less pollinose than in male.

Remarks

In male the pilosity of scutum is variable, with predominantly yellow pile mixes with some black, or with pilosity of mixed pale and black hairs.

Distribution

Nepal.

Figures

Fig. 60. Cheilosia (Cheilosia) spuria sp. nov., holotype, ♂ (CSCA). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing. D. Fore coxa, with arrow indicating basolateral spur. 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. 61. Cheilosia (Cheilosia) spuria sp. nov. A–B. Paratype ♂ and ♀ (CSCA); lateral views. C. Holotype, ♂ (CSCA); head. D. Fore coxa with baso-lateral spur (CSCA). Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.