Sphegina (Asiosphegina) karnataka, Steenis & Hippa & Mutin, 2018

Steenis, Jeroen Van, Hippa, Heikki & Mutin, Valeri A., 2018, Revision of the Oriental species of the genus Sphegina Meigen, 1822 (Diptera: Syrphidae), European Journal of Taxonomy 489, pp. 1-198 : 111-114

Sphegina (Asiosphegina) karnataka sp. nov.

urn:lsid:zoobank.org:act:5189A7C3-FA7B-45CA-8083-528F13F3DABE

Figs 50F , 52F , 53 , 54 D–E, 56A

Differential diagnosis

Very different from all other Sphegina and easily distinguished by the characters given in the key. The spoon-shaped lobe posteriorly on male sternum IV (without expanded apical part in other species) and the deeply bilobed surstylus, with the ventral lobe on the right side as long as the dorsal one (much shorter) are easily observed and unique characters.

Etymology

The specific epithet is derived from the type locality, Karnataka State in India. The name is a noun in apposition.

Material examined

Holotype

INDIA • ♂; “ S. India: Karnataka / Kemmangundi 1200–1500 m / 11–16.ix.1977 / Zool. Mus. Copenhagen Exp”; ZMUC.

Paratype

INDIA • 1 ♂; same data as for holotype; arista missing; JSA .

Description

Male

LENGTH. Body 6.9–7.2 mm, wing 5.3–5.5 mm.

HEAD. Face in lateral view ( Fig. 54D ) concave, strongly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 6.1–6.5; ratio width of ocellar triangle: width of vertex 1: 1.1–1.2; ratio length of ocellar triangle: length of frons 1: 2.1–2.4. Face yellow, light grey pollinose, long pilose along eye-margin. Hypostomal bridge yellow, long pale pilose. Gena and mouth edge yellow with large subtriangular non-pollinose shiny area. Frons and vertex black, predominantly grey pollinose, a trapezoidal area posterior of lunula non-pollinose and shiny, a wide subtriangular macula of heavier grey pollinosity at eye-margin posterior of the shiny part, and medial part with sooty-black pollinosity ( Fig. 54E ); pile short, light yellow. Frons with weak medial furrow. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin. Antenna yellow with black setae dorsally on scape and pedicel; basoflagellomere elongate, ratio width: length 1: 1.8–2.0; arista long pilose, about 3 times as long as basoflagellomere.

THORAX. Colour brown to dark brown, weakly greyish pollinose, scutum with more densely grey pollinose vitta submedially and laterally; postpronotum, postalar callus and dorso-medial part of anepisternum and anepimeron brown-yellow; posterior margin of katepisternum widely non-pollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum sub-rectangular, black, slightly pollinose, with pile slightly longer than on scutum, with two very widely set, very short setae medially at posterior margin, ratio length of scutellum: length of seta 1: 0.8–0.9.

WING. Microtrichose, extensively bare on basal cells; hyaline, stigma yellowish, infuscated along veins bm-cu, dm-cu, M 1 and R 4+5 apically from junction with vein M 1 and at junction of veins R 2+3 and R 4+5. Crossvein dm-cu meeting vein M slightly oblique to nearly perpendicular and vein M 1 meeting vein R 4+5 perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 3–5 black. Metaleg, Fig. 52F , with coxa and trochanter black; femur black and yellow biannulate, strongly incrassate, ratio width: length 1: 3.3–3.5; tibia black and yellow biannulate with long apicoventral dens; tarsus entirely black, basitarsomere rather thin, ratio width: length 1: 3.5–3.7.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.8–4.0: 1.8–2.1: 1.3–1.5; ratio width at posterior margin: medial length of tergum II and III 1: 3.2–3.5 and 1: 0.7–0.8. Terga dark brown, anterior ⅓ of tergum III with brown-yellow fascia which is medially strongly constricted; pile pale, on terga short, laterally on terga I and II long; tergum I with a horizontal row of 3 strong brown-yellow setae at lateral margin; sternum III not sclerotized; sternum IV, Fig. 53B ; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 53 C–F: note the slightly asymmetrical surstyli with the transversely expanded apex of dorsal lobe on the left side one, and the asymmetrical superior lobes.

Female

Unknown.

Figures

Fig. 50. Habitus, dorsal view. A. Sphegina (Asiosphegina) hauseri sp. nov., paratype, ♀, Nepal. B. S. (A.) index Hippa, van Steenis & Mutin, 2015, ♀, Myanmar. C. S. (A.) cf. inflata sp. nov., ♀, Philippines. D. S. (A.) inventum sp. nov., paratype, ♀, Sabah, Malaysia. E. S. (A.) javana de Meijere, 1914, lectotype Ƌ, Java, Indonesia. F. S. (A.) karnataka sp. nov., paratype, Ƌ, India. Scale bars = 1.0 mm.

Fig. 52. Metaleg, dorsal view (A) and anterior view (B–F). A. Sphegina (Asiosphegina) hansoni Thompson, 1966, holotype, Ƌ, Nepal. B. S. (A.) index Hippa, van Steenis & Mutin, 2015, ♀, Kambaiti. C. S. (A.) cf. inflata sp. nov., ♀, Philippines. D. S. (A.) inventum sp. nov., paratype, ♀, Sabah. E. S. (A.) javana de Meijere, 1914, paralectotype, Ƌ, Java. F. S. (A.) karnataka sp. nov., paratype, Ƌ, India. Scale bars = 0.5 mm.

Fig. 53. Sphegina (Asiosphegina) karnataka sp. nov., holotype, Ƌ. A. Posterior part of abdomen, left side lateral view. B. Sternum IV, ventral view. C. Left surstylus, lateral view. D. apexof dorsal lobe of left surstylus, dorsal view. E. Left superior lobe, lateral view. F. Genitalia, right side, lateral view. Scale bars = 0.5 mm.

Fig. 54. Head, lateral view (D, F, I, K) and dorsal view (A–C, E, G–H, J, L). A. Sphegina (Asiosphegina) incretonigra sp. nov., holotype, Ƌ, Vietnam. B. S. (A.) inflata sp. nov., holotype, Ƌ, Philippines. C. S. (A.) inventum sp. nov., paratype, ♀, Sabah, Malaysia. D–E. S. (A.) karnataka sp. nov., paratype, Ƌ, India. F–G. S. (A.) licina sp. nov., holotype, Ƌ, Thailand. H. S. (A.) lucida sp. nov., paratype, Ƌ, Vietnam. I–J. S. (A.) nigerrima Shiraki, 1930, Ƌ, Taiwan. K–L. S. (A.) nigrotarsata sp. nov., paratype, Ƌ, Vietnam. Scale bars = 0.5 mm.