Sphegina (Asiosphegina) inflata, 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 : 103-106

Sphegina (Asiosphegina) inflata sp. nov.

urn:lsid:zoobank.org:act:5B6FF03A-F176-4590-A3E5-945346141D62

Figs 45 C–D, 48, 50C, 52C, 54B

Differential diagnosis

Similar to Sphegina (Asiosphegina) amplistylus sp. nov., S. (A.) philippina and S. (A.) spathigera sp. nov. For distinguishing characters, see under S. (A.) philippina and S. (A.) spathigera sp. nov.

Etymology

The specific epithet is from the Latin ‘ inflata ’, meaning ‘inflated’ and referring to the inflated left-side surstylus.

Material examined

Holotype

PHILIPPINES • ♂; “ P.I. Negros Or. / L. Balinsasayao / 1–7.X.1959 ”; “ L.W. Quate / Collector”; “USNMENT / QR-code / 01224064”; “ Paratype / Sphegina / philippina / Thompson” [yellow label]; USNM.

Description

Male

LENGTH. Body 5.7 mm, wing 4.3 mm.

HEAD. Face in lateral view concave, weakly projected antero-ventrally; frontal prominence very weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 6.6; ratio width of ocellar triangle: width of vertex 1: 1.3; ratio length of ocellar triangle: length of frons 1: 2.7. Face black, ventral half yellow; light grey pollinose, long pilose along eye-margin. Hypostomal bridge dark yellow, long pale pilose. Gena and mouth edge yellow with large subtriangular non-pollinose shiny area. Frons and vertex black, slightly pollinose, a narrow subtriangular area posterior of lunula non-pollinose and shiny ( Fig. 54B ); pile short, light yellow. Frons with weak furrow medially. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin. Antenna brown with black setae dorsally on scape and pedicel; basoflagellomere rectangular, ratio width: length 1: 1.4; arista long pilose, nearly 3 times as long as basoflagellomere.

THORAX. Colour black, weakly greyish pollinose, postpronotum dark brown, densely grey pollinose; posterior margin of katepisternum narrowly non-pollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum short, widely sub-triangular, black, weakly pollinose, long pilose, with pile longer than on scutum, no longer marginal setae observable, it is possible the setae are broken off.

WING. Entirely microtrichose; hyaline, stigma yellowish, membrane brown infuscated at junction of veins R 2+3 and R 4+5. Crossvein dm-cu almost perpendicular to vein M and vein M 1 meeting vein R 4+5 perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 4–5 black. Metaleg (as in Fig. 52C ) with coxa black, trochanter yellow; femur black with basal ⅓ yellow, strongly incrassate, ratio width: length 1: 3.3; tibia black and yellow biannulate with large rounded apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 3.0.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 2.9: 1.5: 1.3; ratio width at posterior margin: medial length of tergum II and III 1: 2.9 and 1: 0.8. Terga black, anterior ⅓ of tergum III with dark brown squarish macula; pile pale, on terga short, laterally on terga I and II long; tergum I with horizontal row of 3 evenly spaced brown-yellow setae at lateral margin; sternum III not sclerotized; sternum IV, Fig. 48B ; sterna

VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 48 C–D: note the asymmetrical surstyli and nearly symmetrical superior lobes.

Female

Unknown.

Remarks

In the type material of Sphegina (Asiosphegina) philippina there is a female (“P.I.: Luzon / Camarines Sur / Mt. Isarog, Pili / 800 m, 30.IV.1965 ”, “H.M. Torrevillas / Collector / Bishop”, coll BPBM, which cannot be S. (A.) philippina because its vertex is wider. This specimen is possibly the female of S. (A.) inflata sp. nov., but as even the males of these similar species are very difficult to distinguish from each other without reference to genitalia the identity of this female remains doubtful.

Figures

Fig. 45. Habitus, lateral view. A. Sphegina (Asiosphegina) incretonigra sp. nov., holotype, Ƌ, Vietnam. B. S. (A.) index Hippa, van Steenis & Mutin, 2015, holotype, Ƌ, Myanmar. C. S. (A.) inflata sp. nov., holotype, Ƌ, Philippines. D. S. (A.) cf. inflata sp. nov., ♀, Philippines. E. S. (A.) inventum sp. nov., holotype, Ƌ, Sabah, Malaysia. F. S. (A.) javana de Meijere, 1914, lectotype Ƌ, Java, Indonesia. Scale bars = 1.0 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.

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. 48. Sphegina (Asiosphegina) inflata sp. nov., holotype, Ƌ. A. Posterior part of abdomen, left side lateral view. B. Sternum IV, ventral view. C. Posterior part of genitalia, left side, lateral view. D. Genitalia right, side, lateral view. Scale bars = 0.5 mm.