Empis (Sphenempis) oshimai Saigusa 2022, sp. nov.
Creators: name: Saigusa, Toyohei
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Empididae
Empis
Empis oshimai

description: Empis (Sphenempis) oshimai sp. nov.
(Figs 1E, 3C, 6)
Type material. HOLOTYPE ♂, labelled: [KYUSHU]/ Satamisaki [30.59N 130.39 E, 100 m]/ KAGOSHIMA / 1962.III.30 /K.OSHIMA; HOLOTYPE / Empis (Sphenempis) / oshimai Saigusa, / 2022. (in Kyushu University Museum). PARATYPE: 1♂, same data as holotype (in Kyushu University Museum).
Etymology. The specific name oshimai is dedicated to the collector of the type series, Mr. K. [Kôhei] Oshima.
Diagnosis. Mesonotum densely greyish brown pollinose; laterotergal brush of black setae; halter entirely dark brown; preapical anterior bristle of mid and hind femora weak; mid femur without posteroventral spines; male abdomen entirely polished blackish; palm-like sclerite of male genitalia with distal finger-like lobes short and a weak dentate proximal lobe.
Description. Male (Fig. 1E). Resembling Sphenempis amurensis Shamshev. Body length 3.7–4.0 mm; wing length 4.4 mm. Coloration. Head blackish brown, densely light grey pollinose. Antenna with pedicel and scape brown, postpedicel black. Palpus brown; labrum brownish yellow, dark brown at extreme tip; labium brown including labella. Thorax blackish brown, densely greyish brown pollinose, postpronotum polished brown on lateral part; viewed from above mesoscutum and scutellum entirely brownish black, with pair of brown stripes inside of dorsocentral rows of bristles. Wing uniformly infuscate to light brown, with membrane polished, pterostigma indistinct; veins dark brown; squama brown with fine brown setae. Halter entirely brown. Abdomen including terminalia blackish brown, terga brilliantly polished; sternum and tergum 1 greyish pollinose; abdomen clothed with longish blackish to brownish setae. Legs yellow; coxae thinly light grey pollinose; mid and hind coxae somewhat infuscate; trochanters black apically; femora and tibiae polished yellow, somewhat darkened on apical 1/2; tarsi brown with yellowish metatarsi.
Most structural and chaetotaxy characters as in description of subgenus stated above. Legs (Figs 6A–F): Mid femur with 2–4 anteroventral and 1–2 posteroventral spines, hind femur slightly longer than 12 times its thickness, with 4–6 anteroventral spines, no posteroventral spines, with weaker anterior preapical seta. Wing (Fig. 3C) 3.2 times as long as wide; cell r 2+3 1.5 times as wide as cell r 4+5 at level of tip of vein R 2+3; discal cell short, 0.44 times as long as vein M 1; axillary lobe wider than in bicoloriventris sp. nov., widest at basal 1/3, with margin strongly curved before middle. Terminalia (Figs 6G–I): Palm-like process with two short, finger-like distal lobes; dentate proximal lobe minute; three lobes shorter than in bicoloriventris sp. nov.; cercus weakly raised posteriorly.
Female. Unknown.
Distribution. Southern Kyushu, Japan.
Type locality. Satamisaki, Kagoshima Pref., Kyushu, Japan.
Remarks. This species resembles E. amurensis in the entirely dark abdomen, but is distinguished from the latter in the following characters: wing with wider axillary lobe; hind femur slenderer and lacking posteroventral spines, with weaker anterior preapical bristle; two distal finger-like lobes of palm-like process shorter, but with a short proximal lobe. This species is rare and confined to the southern part of Kyushu, as it has not been collected from the middle and northern areas of Kyushu notwithstanding the author’s extensive surveys in these areas.
description: Published as part of Saigusa, Toyohei, 2022, Sphenempis, a new Empis subgenus (Diptera, Empididae) from the Eastern Palaearctic Region, pp. 105-117 in Zootaxa 5129 (1) on pages 113-116, DOI: 10.11646/zootaxa.5129.1.6, http://zenodo.org/record/6488262