Sphegina (Asiosphegina) prolixa 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 prolixa

description: Sphegina (Asiosphegina) prolixa sp. nov.
urn:lsid:zoobank.org:act: CD691191-6E81-42FC-8F1F-42619911DB72
Figs 75D, 78, 79B, 84 I–J
Differential diagnosis
In the non-genitalic characters the species is similar to Sphegina (Asiosphegina) ghatsi sp. nov. and is distinguished by the characters given in the key. In the male genitalia the species are not especially similar. Sphegina (Asiosphegina) prolixa sp. nov. is easily distinguished from S. (A.) ghatsi sp. nov., as well as any other known Sphegina, by the narrow and extremely long sublobe posteroventrally on its superior lobe.
Etymology
The specific epithet is from the Latin ‘ prolixa ’, meaning ‘stretched out or long’ and referring to the exceedingly long posteroventral lobe on the male right-side superior lobe.
Material examined
Holotype
MALAYSIA • ♂; “ W. Malaysia: / Selangor / [leg] A.E. Stubbs / BMNH 1974–87 ”; “ Genting Tea Estate / Genting Sembah, / forest 2000 feet / 24–27.xii.1972 ”; terga III–VIII and the long thin extension of the superior lobe missing; NHM.
Paratype
THAILAND • 1 ♂; “Thailand: Chiang Mai Pt. Doi Inthanon / National Park Huai Sai Leung yellow falls; / 18°31 ʹ N, 98°27 ʹ E; 1000 m; 3–12.III.2002; / Malaise trap ”; QSBG.
Description
Male
LENGTH. Body 5.2 mm, wing 3.4–3.9 mm.
HEAD. Face in lateral view concave, weakly projected antero-ventrally; frontal prominence weakly developed. Ratio width of vertex at anterior ocellus: width of head 1: 4.5–4.7; ratio width of ocellar triangle: width of vertex 1: 1.4–1.5; ratio length of ocellar triangle: length of frons 1: 1.7–2.0. 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; with dense velvet-black pollinosity, with an oval area posterior of lunula non-pollinose and shiny, with subtriangular grey pollinose lateral macula posteriorly from shiny area (Fig. 84I); pile short, light yellow. Frons with narrow and weak furrow medially. Occiput black, light grey pollinose, light yellow pilose. Eye with an area of slightly enlarged facets at anterior margin (Fig. 84J). Antenna with scape and pedicel dark brown, basoflagellomere light-brown, with black setae dorsally on scape and pedicel; basoflagellomere rectangular, ratio width: length 1: 1.3–1.4; arista nearly bare, 3.5 times as long as basoflagellomere.
THORAX. Colour black, weakly greyish pollinose; posterior margin of katepisternum narrowly nonpollinose, shiny; scutum and pleuron with very short adpressed light yellow pile. Scutellum semicircular, black, shiny medially and weakly pale pollinose laterally, with pile slightly longer than on scutum, without marginal setae, probably broken off.
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 with femur dark yellow on medial ¼– ⅓; tibia with dark brown annulus on apicomedial 1/5– ⅓ and tarsomere 1 on apical half and entire tarsomeres 3–5 and in paratype also tarsomere 2 black. Metaleg with coxa black, trochanter yellow; femur black with basal 1/5–¼ yellow, incrassate, ratio width: length 1: 3.2–3.4; tibia yellow with apical half dark brown to black, with long and wide apicoventral dens; tarsus entirely black, basitarsomere thick, ratio width: length 1: 3.0–3.4.
ABDOMEN. Length ratio of terga I: II: III: IV 1: 3.1–3.7: 1.8: 1.7; ratio width at posterior margin: medial length of tergum II and III 1: 3.6–4.0 and 1: 0.8. Terga black, anterior ⅜ of tergum III with yellow fascia; tergum IV with narrow elongate dark brown macula along anterolateral margin; pile pale, on terga short, laterally on terga I and II long; tergum I with horizontal row of 4–6 irregularly placed light yellow setae at lateral margin; sternum III not sclerotized; sternum IV, Fig. 78C; sterna VI, VII and VIII simple, with long yellow pile. Genitalia, Fig. 78 A–B, D–F: note the symmetrical surstyli and asymmetrical superior lobes.
Female
Unknown.
Remarks
Among the material studied a female (1 ♀; “ Thailand: Chiang Mai Prov. / Chiang Mai Botanical Garden QSBG / 18.8955° N, 98.8636° E / 11–25.VII.2013, coll M. Hauser” (CSCA)) was found which may belong to this species.
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 153-155, DOI: 10.5852/ejt.2018.489, http://zenodo.org/record/3830537