Gimnomera torikurai, Iwasa, 2021

Iwasa, Mitsuhiro, 2021, Three new species and six new records of Scathophagidae (Diptera) from Japan with a key to the Japanese genera, Zootaxa 4981 (3), pp. 531-553 : 539-541

Gimnomera torikurai sp. nov.

( Figs 21–27 )

[Japanese name: Torikura-shiributo-funbae]

Type material examined. Holotype ♂, JAPAN: Kawanishi, Obihiro, Tokachi , Hokkaido, 29. iv. 2017, leg. H. Torikura ( OUAVM) . Paratypes: 1 ♂, same data as holotype ( OUAVM) ; 1 ♂, same locality as holotype, 9. v. 2014, leg. H. Torikura ( OUAVM) ; 2 ♂, 3 ♀, same locality, 1-7. v. 2015, leg. H. Torikura ; 2 ♂, same locality, 30. iv. 2019, leg. H. Torikura ( OUAVM) ; 1 ♂, Obihiro , Tokachi, 16. v. 2015, leg. H. Torikura ( OUAVM) ; 1 ♀, Makubetsu , Tokachi, 27. iv. 2017, leg. H. Torikura ; 4 ♂, Toyokoro , Tokachi, 4. v. 2013, leg. M. Iwasa ( OUAVM) ; 1 ♂, 1 ♀, Obihiro , Tokachi, 16. v. 2000, leg. T. Watanabe ( OUAVM) ; 1 ♀, same locality, 1. v. 2000, leg. T. Watanabe ( OUAVM) .

Diagnosis. Gimnomera torikurai sp. nov. can be recognized by the black thoracic pleura with greyish dusting and the shape of male surstylus.

Description. Male ( Fig. 21 ). Head ( Fig. 22 ): eyes reddish brown; frontal vitta reddish yellow; fronto-orbital plate and ocellar triangle black; face light brown with silvery microtrichose; parafacial yellow; genae narrow and yellow to grey with silvery microtrichose; postgenae and occiput dark grey microtrichose; postpedicel dark brown and approximately 2 times as long as wide; pedicel yellow; arista pubescent; palpi yellow and clavate, covered with short setulae; proboscis stout, with reduced labella; vibrissal angle with 1 strong and 2-3 subvibrissae. Chaetotaxy (black): 5 fr (medioclinate), 2 or (1 lateroclinate, 1 latero-reclinate), 1 oc, 1 poc, 1 vte, 1 vti. Thorax: wholly black with grey dusted; scutum with 4 longitudinal black stripes; postpronotum without erect black spinules on the anterior margin; proepisternum covered with hairs; anepisternum posteriorly with hairs; katepisternum sparsely with hairs; anepimeron, meron, and katatergite bare; metanotum bare and grey microtrichose. Chaetotaxy (black): 2 pprn, 2 npl, 1+2 ial; 2 sa, 2 pa, 2+3 dc, 1 dsc, 1 apsc; 1 prepm (yellow), 2-3 anepst, 1 kepst. Wings: hyaline, slightly tinged with brown; veins brown; vein R 1 with dorsal setulae on apical portion; veins R 4+5 and M 1 almost parallel; vein A 1 +CuA 2 abruptly end well before wing margin; calypter whitish yellow with hairs marginally; halteres yellow. Legs: coxae yellow to brown, femora and tibiae entirely yellow; fore femur ventrally covered with hairs; fore tibia with 1 apical d seta; mid tibia with apical d seta; hind tibia with 1 ad and 1 pd at middle, 1 pd basal one-third, 1 apical d, and 3-4 preapical setae; tarsi yellow, darkened apically. Abdomen: tergites I-V black and VI-VIII brown, covered with hairs; tergites I-II grey microtrichose and III-VIII rather shiny; sternite V ( Fig. 23 ) with two broad median posterior lobes, covered with short spines; epandrium ( Figs. 24, 25 ) sparsely with hairs but without setae; surstylus ( Figs 24, 25 ) long and slender, tapered apically; aedeagus ( Fig. 26 ) slender and apically membranous; epiphallus rod-shaped and slightly curved; paramere clavate, with setulae posteroapically; hypandrium strongly sclerotized and V-shaped; cercus ( Figs 24, 25 ) somewhat slender, apically close to each other, sparsely covered with hairs and posteriorly with marginal setulae.

Female. Abdominal sternites III to VI rounded square; segments VII to VIII sternites VII longitudinally elongate; segments (tergites and sternites) VII to VIII compressed and tegites VIII and sternite VIII strongly sclerotized and pigmented ( Fig. 27 ); cercus, epiproct and hypoproct weakly sclerotized ( Fig. 27 ). Other characteristics as those of male.

Length (♂ ♀). Body, 6.0–6.5 mm; wings, 5.0 mm.

Distribution. Japan (Hokkaido).

Etymology. This new species is named after Mr. H. Torikura who first collected this species.

Remarks. Ozerov (2019) synonymized Langechristia Ozerov with Gimnomera in his review of the Russian Gimnomera . Gimnomera torikurai sp. nov. belongs to the Langechristia group ( G. amica (Ozerov) , G. speciosa (Ozerov) , and G. ziegleri (Ozerov)) , which has no short erect black spinules on the anterior margin of the postpronotum. The present new species differs from other species of the Langechristia group in having the black thoracic pleura with greyish dusting and by the structure of male surstyli and cerci.

Bionomics. This new species were collected from both flowers communities of Corydalis ambigua Cham. et Schltdl and C. incisa (Thunb.) Per. in early spring. The larvae possibly develop in the seed capsules of these flowers.

Figures

FIGURES 21–27. Gimnomera torikurai sp. nov. 21, Male, lateral view; 22, Male head, left lateral view; 23, Male sternite V, ventral view; 24, Male terminalia, left lateral view; 25, Male terminalia, posterior view; 26, Aedeagus and associated parts; 27, Female terminalia, left lateral view. Abbreviations—Head: subvib, subvibrissa; vib, vibrissa. Abdomen: aed, aedeagus; epiph, epiphallus; pmlb, posterior median lobe; pm, paramere.