Sphegina (Asiosphegina) fimbriata, 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 : 77-78

Sphegina (Asiosphegina) fimbriata sp. nov.

urn:lsid:zoobank.org:act:09FC2232-2D13-4691-A180-B2582ABE1C94

Figs 28F , 32 , 38B

Differential diagnosis

The species is similar to Sphegina (Asiosphegina) crinita sp. nov. For comparison and distinguishing characters see under the latter.

Etymology

The specific epithet is from the Latin ‘ fimbriata ’, meaning ‘fringed’ and referring to the fringe of long setae on left-side of the male superior lobe.

Material examined

Holotype

THAILAND • ♂; “ Thailand / Chiangmai Prov. / Doi Suthep / 1–5.IV.1958 ”; “ T.C. Maa / Collector / Bishop”; antenna, left proleg, both mesolegs, left metaleg and right tarsomeres 4–5 of metatarsus missing; BPBM.

Description

Male

LENGTH. Body 5.9 mm, wing 4.6 mm.

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: 5.5; ratio width of ocellar triangle: width of vertex 1: 1.7; ratio length of ocellar triangle: length of frons 1: 1.6. Face black, ventral half brown yellow, light grey pollinose, long pilose along eye-margin. Hypostomal bridge brown, long pale pilose. Gena and mouth edge brown-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. 38B ); pile short, light yellow. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of enlarged facets at anterior margin. Antenna lost.

THORAX. Colour black, weakly greyish pollinose, postpronotum, postalar callus and dorso-medial part of anepisternum and anepimeron brown-yellow, pleuron entirely grey pollinose; scutum and pleuron with very short adpressed light yellow pile. Scutellum sub-rectangular, black, greyish pollinose, with pile slightly longer than on scutum, no marginal setae observable, probably broken off.

WING. Entirely microtrichose; hyaline, stigma yellowish. Crossvein dm-cu meeting vein M very obliquely and vein M

1

meeting vein R

4+5

perpendicularly.

LEGS. Proleg yellow, tarsomeres 3–5 black. Metaleg with coxa black, trochanter yellow; femur orangebrown, strongly incrassate, ratio width: length 1: 3.1; tibia black and yellow biannulate, with long subtriangular apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 3.5.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.6: 1.7: 1.4; ratio width at posterior margin: medial length of tergum II and III 1: 4.5 and 1: 0.9. Terga black, anterior ⅓ of tergum III and anterior 1/6 of tergum IV with yellow anterolateral maculae; pile pale, on terga short, laterally on terga I and II long; tergum I with an oblique row of 4 white setae at lateral margin; sternum III not entirely visible as it is partly hidden under sternum II; sternum IV, Fig. 32A ; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 32 B–F: note the nearly symmetrical surstyli and asymmetrical superior lobes.

Female

Unknown.

Figures

Fig. 28. Habitus, lateral view. A. Sphegina (Asiosphegina) cultrigera Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. B. S. (A.) dentata sp. nov., paratype, Ƌ, Taiwan. C. S. (A.) distincta sp. nov., paratype, Ƌ, Vietnam. D. S. (A.) exilipes sp. nov., holotype, Ƌ, Java, Indonesia. E. S. (A.) farinosa sp. nov., holotype, Ƌ, Sabah, Malaysia. F. S. (A.) fimbriata sp. nov., holotype, Ƌ, Thailand. Scale bars = 1.0 mm.

Fig. 32. Sphegina (Asiosphegina) fimbriata sp. nov., holotype, Ƌ. A. Sternum IV, ventral view. B. Left cercus, lateral view. C. Left surstylus, lateral view. D. Sternum IX and superior lobe, left side, lateral view. E. Right surstylus, lateral view. F. Sternum IX and superior lobe, right side, lateral view. Scale bars = 0.5 mm.

Fig. 38. Head, lateral view (C, K), dorsal view (A–B, D, F–J, L) and frontal view (E). A. Sphegina (Asiosphegina) farinosa sp. nov.,holotype, Ƌ, Sabah, Malaysia. B. S. (A.) fimbriata sp. nov., holotype, Ƌ, Thailand. C–D. S. (A.) forceps Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. E. S. (A.) furva Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. F. S. (A.) ghatsi, sp. nov., holotype, Ƌ, India. G. S. (A.) gigantea sp. nov., holotype, Ƌ, China. H. S. (A.) granditarsis sp. nov., paratype, Ƌ, Thailand. I. S. (A.) hamulata sp. nov., holotype, Ƌ, India. J. S. (A.) hansoni Thompson, 1966, holotype, Ƌ, Nepal. K–L. S. (A.) hauseri sp. nov., paratype, Ƌ, Nepal. Scale bars = 0.5 mm.