Sphegina (Asiosphegina) setosa, 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 : 155-161

Sphegina (Asiosphegina) setosa sp. nov.

urn:lsid:zoobank.org:act:2DCB6D0F-B4A5-4BF9-AB31-FD1478B886BC

Figs 75F , 80–81 , 95B

Differential diagnosis

Sphegina (Asiosphegina) setosa sp. nov. is not especially similar to other Sphegina and is easily recognized by the characters in the key.

Etymology

The specific epithet is from the Latin ‘ setosa ’, referring to the strong setae on the tubercle on male sternum VI.

Material examined

Holotype

NEPAL • ♂; “ Nepal , nr Ktmd. [ Kathmandu ] / Bhurumche 85–9500‘ [ft] / Oak forest / 5–VI–[19]67 / Can. Nepal Exp. ‘67”; “ CNC DIPTERA / # 143310”; CNC.

Paratype

NEPAL • 1 ♂; same data as for holotype; JSA .

INDIA • 1 ♂; “India, W.B. / Rangiroon 6500’ [ft] / 24.V 1962 / [leg.] Gupta”; “Ghorpade / Collection / Bangalore”; badly damaged specimen, without head and almost no mid legs; USNM.

Description

Male

LENGTH. Body 6.5–7.1 mm, wing 5.4–5.6 mm.

HEAD. Face in lateral view concave, strongly projected antero-ventrally; frontal prominence weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 3.7–3.9; ratio width of ocellar triangle: width of vertex 1: 2.4–2.6; ratio length of ocellar triangle: length of frons 1: 2.4–2.6. Face black, light grey pollinose, long pilose along eye-margin. Hypostomal bridge black, long pale pilose. Gena and mouth edge black, pale pollinose with large subtriangular non-pollinose shiny area. Frons and vertex black, predominantly grey pollinose, a wide medial vitta posterior of lunula non-pollinose and shiny; pile short, light yellow. Frons with deep anteromedial pit and wide medial furrow. Occiput black, light grey pollinose, light yellow pilose. Eye without enlarged facets at anterior margin. Antenna brown with black setae dorsally on scape and pedicel; basoflagellomere oval, ratio width: length 1: 1.4–1.6; arista long pilose, nearly 4 times as long as basoflagellomere.

THORAX. Colour dark brown to black, weakly greyish pollinose, pleuron entirely more heavily grey pollinose; scutum and pleuron with very short adpressed light yellow pile. Scutellum semicircular, dark brown, grey pollinose, pile slightly longer than on scutum (the setae broken but still fixed to scutellum),

with widely set medium long setae medially at posterior margin, ratio length of scutellum: length of seta 1: 1.5–1.9.

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

1

meeting vein R

4+5

perpendicularly.

LEGS. Pro- and mesoleg yellow, tarsomeres 4 and 5 brown to black. Metaleg, Fig. 95B , with coxa black, trochanter yellow; femur black with basal ½ yellow, slightly incrassate, ratio width: length 1: 4.2–5.0, in profile baso-dorsally slightly concave; tibia black and yellow biannulate with very weak rounded apicoventral dens; tarsus entirely black, basitarsomere rather thin, ratio width: length 1: 3.7–4.0.

ABDOMEN. Length ratio of terga I: II: III: IV 1: 4.4–4.7: 1.9–2.3: 1.5–2.0; ratio width at posterior margin: medial length of tergum II and III 1: 4.7–5.9 and 1: 0.9–1.2. Tergum IV slightly skewed to the right. Terga black, anterior ⅓ of tergum III with yellow fascia; pile pale, on terga short, laterally on terga I and II long; tergum I with 2–3 widely separated black setae at lateral margin; sternum III rectangular, ratio width: length 1: 1.7–2.0; sternum IV, Figs 80B , 81B ; sternum VII with long black seta associated with pale ones on a rounded tubercle; sterna VI and VIII simple, with long yellow pile. Genitalia, Figs 80 C– E, 81C–E: note the strongly asymmetrical surstyli and superior lobes.

Female

Unknown.

Remarks

Among the material studied, there are two specimens (1 ♀; “Nepal, nr Ktmd. / Godavari 6000’ [feet] / VII.17–20.1967 / Mal tr., Can. Exp.”; CNC. INDIA: 1 ♀; “School of Entomology / St John’s College / Agra-2 India”; “Kumaon Survey / II.2 Ramgarh / M.S. Mani & Party / 18, 20, 22–24.VI.1974 ”; “11 2–24.VI.74”; “Ghorpade / Collection / Bangalore” (JSA)) possibly belonging to this species.

Figures

Fig. 75. Habitus, lateral view. A. Sphegina (Asiosphegina) plautus sp. nov., paratype, Ƌ, China. B. S. (A.) plautus sp. nov., paratype, ♀, China. C. S. (A.) pollinosa Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. D. S. (A.) prolixa, sp. nov., paratype, Ƌ, Thailand. E. S. (A.) radula Hippa, van Steenis & Mutin, 2015, paratype, Ƌ, Myanmar. F. S. (A.) setosa sp. nov., paratype, Ƌ, Nepal. Scale bars = 1.0 mm.

Fig. 80. Sphegina (Asiosphegina) setosa sp. nov., holotype, Ƌ. A. Posterior part of abdomen, left side lateral view. B. Sternum IV, ventral view. C. Left surstylus, lateral view. D. Left superior lobe with associated parts, lateral view. E. Genitalia, right side, lateral view. Scale bars = 0.5 mm.

Fig. 81. Sphegina (Asiosphegina) setosa sp. nov., paratype, Ƌ, India. A. Sternum VII, ventral view. B. Sternum IV, ventral view. C. Left surstylus, lateral view. D. Left superior lobe with associated parts, lateral view. E. Genitalia, right side, lateral view. Scale bars = 0.5 mm.

Fig. 95. Metaleg, anterior view. A. Sphegina (Asiosphegina) plautus sp. nov., holotype, Ƌ, China. B. S. (A.) setosa sp. nov., holotype, Ƌ, Nepal. C. S. (A.) strigillata sp. nov., holotype, Ƌ, Vietnam. D. S. (A.) umbrosa sp. nov., holotype, Ƌ, China. E. S. (A.) varidissima Shiraki, 1930, Ƌ, Taiwan, yellow form. Scale bars = 0.5 mm.