Sphegina (Asiosphegina) exilipes Steenis & Hippa & Mutin 2018, sp. nov.
Creators: name: Steenis, Jeroen Van
name: Hippa, Heikki
name: Mutin, Valeri A.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Sphegina
Sphegina exilipes

description: Sphegina (Asiosphegina) exilipes sp. nov.
urn:lsid:zoobank.org:act: BB30096D-780C-4C5C-B40F-A60EC7E4BB3D
Figs 28D, 29, 30L, 33C
Differential diagnosis
Sphegina (Asiosphegina) exilipes sp. nov. is similar to S. (A.) javana. In addition to the characters mentioned in the key, S. (A.) exilipes sp. nov. differs by a slightly narrower metafemur (see measurements in the descriptions) and the following differences in male genitalia: ventral lobe of right surstylus rectangular (more elongate and with pointed apex in S. (A.) javana); dorsal lobe of right surstylus straight with a ventral sublobe (the apical part curved dorsally and without ventral sublobe); sternum IX with strong transverse ridge-like lobe (a weak ridge present on dorsal part only); superior lobe posteriorly simple (with two triangular teeth).
Etymology
The specific epithet is from the Latin ‘ exilipes ’, meaning ‘thin-legged’ and referring to the slender metafemur.
Material examined
Holotype
INDONESIA • ♂; Java; “ Pangrango / 2000 m / 14.VI. ’19 DvL”; terga III–VIII missing; NBC.
Description
Male
LENGTH. Body not measurable due to missing part of abdomen, wing 5.2 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: 5.3; ratio width of ocellar triangle: width of vertex 1: 2.0; ratio length of ocellar triangle: length of frons 1: 2.7. Face yellow, light grey pollinose, long pilose along eye-margin. Hypostomal bridge yellow, long pale pilose. Gena and mouth edge yellow, pale pollinose, with large subtriangular non-pollinose shiny area. Frons and vertex black, sub-shiny, slightly grey pollinose, a circular area posterior of lunula non-pollinose and shiny and with narrow more densely grey pollinose fascia posterior of the shiny part; pile short, light yellow (Fig. 30L). Frons with long, very wide but shallow medial furrow. Occiput black, light grey pollinose, light yellow pilose. Eye with enlarged facets at anterior margin. Antenna dark brown to black with black setae dorsally on scape and pedicel; basoflagellomere oval, ratio width: length 1: 1.3; arista short pilose on basal half only, about 3 times as long as basoflagellomere.
THORAX. Colour dark brown to black, scutum with densely grey pollinose vitta submedially; postpronotum and dorso-medial part of anepisternum and anepimeron brown-yellow; posterior margin of katepisternum narrowly non-pollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum semicircular, black, shiny, with pile slightly longer than on scutum, with two closely set medium long setae medially at posterior margin, ratio length of scutellum: length of seta 1: 1.6.
WING. Microtrichose, basal 1/5 of cell cup bare; hyaline, stigma yellowish. Crossvein dm-cu meeting vein M strongly oblique and vein M 1 meeting vein R
4+5
perpendicularly.
LEGS. Proleg yellow, tarsomeres 4 and 5 black; mesofemur nearly entirely dark yellow, tibia dark yellow on apico-medial ¼, tarsomeres 4 and 5 black. Metaleg, Fig. 33C, with coxa black, trochanter dark brown; femur with basal ⅓ yellow, slightly incrassate, ratio width: length 1: 5.1; tibia nearly entirely dark brown to black, without apicoventral dens; tarsus entirely black, basitarsomere rather thin, ratio width: length 1: 3.9.
ABDOMEN. Length ratio of terga I and II 1: 5.3; ratio width at posterior margin: length of tergum II is 1: 3.8. Terga black; pile pale, on terga short, laterally on terga I and II long; tergum I with an oblique row of 4–5 light yellow setae at lateral margin; sternum IV, Fig. 29A; VI, VII and VIII lost. Genitalia, Figs 29B, 24C: tergum IX, cerci, and left side surstylus and superior lobe destroyed.
Female
Unknown.
description: Published as part of Steenis, Jeroen Van, Hippa, Heikki & Mutin, Valeri A., 2018, Revision of the Oriental species of the genus Sphegina Meigen, 1822 (Diptera: Syrphidae), pp. 1-198 in European Journal of Taxonomy 489 on pages 72-74, DOI: 10.5852/ejt.2018.489, http://zenodo.org/record/3830537