Megaphthalmoides vittatus Iwasa 2021, sp. nov.
Creators: name: Iwasa, Mitsuhiro
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Scathophagidae
Megaphthalmoides
Megaphthalmoides vittatus

description: Megaphthalmoides vittatus sp. nov.
[Japanese name: Kurotsuno-sesuji-funbae]
(Figs 38–43)
Type material examined. Holotype ♂, JAPAN: Kamikochi, Azumimura, Nagano Pref., Honshu, 3-4. x. 1988, leg. S. Shinonaga (OUAVM). Paratypes: Honshu, 1 ♂, Tôshichi Spa, Hachimantai City, Iwate Pref., 3. viii. 2013, leg. D. Kato (OUAVM); 1 ♂, Hatomati-toge, Oze, Gumma Pref. 7. vii. 1951, leg. H. Hasegawa (IAES); 1 ♂, Gumma Pref., 23. ix. 1950, leg. N. Fukuhara (IAES).
Diagnosis. Megaphthalmoides vittatus sp. nov. can be recognized by frontal vitta with a distinct black pattern and wholly black postpedicel.
Description. Male (Fig. 38). Head (Fig. 39): eyes reddish brown; frontal vitta with a distinct black pattern; fronto-orbital plate yellow; ocellar triangle dark; face yellow and shiny; parafacial very narrow; gena and postgena yellow slightly with silvery microtrichose; occiput yellow and shiny; postpedicel (Fig. 40) black and approximately 2 times as long as wide; pedicel yellow; arista short-haired; palpus yellow and filiform, sparsely with short setulae anteroventrally; proboscis yellow to brown; vibrissal angle with 1 strong seta and 1 subvibrissae. Chaetotaxy (black): 2-3 fr (medioclinate), 2 or (1 proclinate, 1 latero-reclinate), 1 oc, 1 vti, 1 vte, 1 poc. Thorax: wholly yellow and shiny; scutum and prescutum with weak longitudinal stripe; proepisternum bare; anepisternum, katepisternum and anepimeron sparsely covered with short hair-like setulae; meron and katatergite bare; metanotum bare and slightly silvery microtrichose. Chaetotaxy (black): 2 pprn, 2 npl, 1+2 ial; 2 sa, 2 pa, 2+3 dc, 1 bsc, 1 apsc; 1 prepm, 2-1 (2 long, 1 short) anepst, 1 kepst. Wings: hyaline, slightly tinged with brown; veins brown; veins R 4+5 and M 1 almost parallel; vein A 1 +CuA 2 reach wing margin; calypter yellow with hairs marginally; halter yellow. Legs: coxae yellow to light brown; femora and tibiae yellow; fore femur yellow, ventrally and posterodorsally covered with hairs and setulae; mid femur apically black, with several a setulae; hind femur apically black with a row of ad setae; fore tibia with 1 p seta at basal two-fifths, 1 d seta near half and 1 preapical pd and 1 preapical d; mid tibia with 1 ad and 1 av setae at distal one-third and 1 apical av and 1 apical pv; hind tibia with 3 ad and 3 pd setae at regular intervals and 1 apical av; tarsi dark brown. Abdomen: tergites brown to dark brown and shiny, covered with hair-like setulae and distinct setae at posterior margin of each segment; sternite V (Fig. 41) bilobate posteriorly, covered with long and short setae on lobes; epandrium (Figs 42, 43) sparsely covered with short setae; surstylus (Figs 42, 43) long and slender, tapered apically; aedeagus stout and sclerotized; epiphallus rod-shaped and tapering apically; paramere comparatively thick with 1 short setula posteroventrally; hypandrium sclerotized and rounded, rhombus-shaped; cercus (Figs. 42, 43) somewhat elongated, covered with hair-like setulae.
Length (♂). Body, 5.0–5.2 mm; wings, 5.8 mm.
Female. Unknown.
Distribution. Japan (Honshu).
Etymology. The scientific name derives from the Latin vitta meaning band, referring the presence of a distinct black band on the frons of the head.
Remarks. This species is closely similar to M. unilineatus (Zetterstedt), but can be distinguished from it by characteristics mentioned in the following key.
description: Published as part of Iwasa, Mitsuhiro, 2021, Three new species and six new records of Scathophagidae (Diptera) from Japan with a key to the Japanese genera, pp. 531-553 in Zootaxa 4981 (3) on page 545, DOI: 10.11646/zootaxa.4981.3.6, http://zenodo.org/record/4921413