Sphegina (Asiosphegina) bifida, 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 : 43-45

Sphegina (Asiosphegina) bifida sp. nov.

urn:lsid:zoobank.org:act:E16EF3C9-3BE4-4659-B7B0-AC03CF500474

Figs 11D , 14 , 21E

Differential diagnosis

Very similar to Sphegina (Asiosphegina) collicola sp. nov. and S. (A.) inventum sp. nov. For distinguishing characters, see under S. (A.) inventum sp. nov.

Etymology

The specific epithet is from the Latin ‘ bifida ’, meaning ‘split into two parts’ and referring to the bifid lobe posteriorly on male sternum IV.

Material examined

Holotype

MALAYSIA • ♂; “ Malaysia : Sabah: / 1 km S. Kundasang. / el. 1530 m. 10 Sept.1983 / [leg.] G.F. Hevel & W.E. Steiner ”; “USNMENT / QR code / 01224071”; wings wrinkled and distorted; USNM.

Description

Male

LENGTH. Body 5.8 mm, wing; not measurable due to wrinkling of the wing.

HEAD. Face in lateral view concave, very weakly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 5.9; ratio width of ocellar triangle: width of vertex 1: 1.3; ratio length of ocellar triangle: length of frons 1: 3.3. Face black; light grey pollinose, long pilose along eye-margin. Hypostomal bridge black, long pale pilose. Gena and mouth edge black, gena with large subtriangular non-pollinose shiny area. Frons and vertex black slightly pollinose with circular area posterior of lunula non-pollinose and shiny, with densely grey pollinose vitta sub-anteriorly and posteriorly with velvet black pollinosity; 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 ( Fig. 21E ). Antenna black with black setae dorsally on scape and pedicel; basoflagellomere round, ratio width: length 1: 1.1; arista weakly short pilose, about 3 times as long as basoflagellomere.

THORAX. Colour dark brown to black, weakly greyish pollinose; posterior margin of katepisternum narrowly non-pollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum sub-rectangular, black, sub-shiny and weakly pollinose, with pile slightly longer than on scutum, with two widely set setae; length of setae not measurable as the apices are broken off.

WING. Microtrichose, on basal part of cell bm only sparsely microtrichose, almost bare; hyaline, stigma yellowish. Crossvein dm-cu meeting vein M perpendicularly and vein M 1 meeting vein R 4+5 perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 4 and 5 black. Metaleg with coxa and trochanter black; femur black with basal 1/5 yellow, slightly incrassate, ratio width: length 1: 3.5; tibia yellow with apical ⅓

black, widened apically, with subtriangular apicoventral dens; tarsus entirely black, basitarsomere very thick, ratio width: length 1: 2.5.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.6: 1.6: 1.4; ratio width at posterior margin: medial length of tergum II and III 1: 6.0 and 1: 0.8. Terga black, anterior 1: 3.4 of tergum III with red-brown fascia; pile pale, on terga short, laterally on terga I and II long; tergum I with 3 strong light yellow setae at lateral margin; sternum IV, Fig. 14A ; sterna VI, VII and VIII simple, with short yellow pile. Genitalia, Fig. 14 B–D: note the strong asymmetry of surstyli and superior lobes.

Female

Unknown.

Figures

Fig. 11. Habitus, lateral view. A. Sphegina (Asiosphegina) atricolor Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. B. S. (A.) atrimanus sp. nov., holotype, Ƌ, Vietnam. C. S. (A.) bidens Hippa, van Steenis & Mutin, 2015, paratype, ♀, Myanmar. D. S. (A.) bifida sp. nov., holotype, Ƌ. E. S. (A.) bilobata Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. Scale bars = 1.0 mm.

Fig. 14. Sphegina (Asiosphegina) bifida sp. nov., holotype, Ƌ. A. Sternum IV, ventral view. B. Left surstylus, lateral view. C. Left superior lobe, lateral view. D. Genitalia, right side, lateral view. Scale bars = 0.5 mm.

Fig. 21. Head, lateral view (A, D, F, J–K), dorsal view (B, C, G–H, L), frontal view (E, I). A–B. Sphegina (Asiosphegina) albolobata sp. nov., holotype, Ƌ, Vietnam. C. S. (A.) amplistylus sp. nov., holotype, Ƌ, Philippines. D. S. (A.) apicalis Shiraki, 1930, ♀, Taiwan. E. S. (A.) bifida sp. nov., holotype, Ƌ, Sabah, Malaysia. F–G. S. (A.) bracon sp. nov., paratype, Ƌ, Vietnam. H–I. S. (A.) bispinosa Brunetti, 1915, Ƌ, Nepal. J. S. (A.) brevipilis sp. nov., holotype, Ƌ, China. K–L. S. (A.) collicola sp. nov., paratype, Ƌ, Malaysia. Scale bars = 0.5 mm.