Cordilura shinonagai, Iwasa, 2020

Iwasa, Mtsuhiro, 2020, Contribution to the knowledge of the genus Cordilura Fallén (Diptera, Scathophagidae) from Japan, with descriptions of three new species, Zootaxa 4748 (3), pp. 471-484 : 479-481

Cordilura shinonagai sp. nov.

[Japanese name: Higenaga-kuroashi-funbae]

( Figs 24–27 )

Type material examined. Holotype ♂, Japan: Mt. Hayachine, Iwate Pref., Honshu , 17–18. vi. 1971, leg. S. Shinonaga ( OUAVM) . Paratype. 1 ♂, same data as holotype ( OUAVM) .

Diagnosis. Males of C. shinonagai sp. nov. can be recognized by black and shining body, black femora and brown tibiae and tarsi, and surstylus bifurcated into anterior and posterior lobes.

Description. Male ( Fig. 24 ; holotype). Head: eyes reddish brown; frons black, anteriorly yellow; face and parafacial thickly silvery pruinose; gena brown, posteriorly microtrichose; postgena wholly microtrichose; occiput black and subshining; postpedicel basally brown and apically dark brown, approximately 3 times as long as wide; arista plumose, larger than postpedicel; palpus with strong subapical seta as long as palpus; proboscis black, stout, with developed labella; vibrissal angle with 1 vibrissa and 1 subvibrissa. Chaetotaxy (black); 3–4 fr, 3 or (1 proclinate, 1 lateroclinate, 1 lateroreclinate), 1 oc, 1 vti (strong), 1 vte, 1 poc.

Thorax: shining reddish brown to black; presutural area of scutum centrally with a slight whitish longitudinal stripe; scutellum shining; proepisternum, anepisternum and katepisternum slightly grey microtrichose, and sparsely covered by long hairs; anepimeron and katatergite subshining; meron and anatergite slightly grey microtrichose; metanotum subshining. Chaetotaxy (black): 2 pprn, 2 npl, 1 presut ial, 2+3 dc; 2 sa, 2 pa, 2 prepst, 1 prepm, 1 strong and 3–4 weak anepst, 1 kepst, 1 dsc, 1 apsc. Wings: hyaline, slightly tinged with brown; veins brown; veins R 2+3 and M divergent apically; vein A 1 +CuA 2 extending to wing margin; calypter whitish yellow, with hairs marginally; halteres yellow, darkened basally. Legs: all coxae black, apically thin pruinose; all femora black; fore femur ventrally covered by whitish hairs; fore tibiae brown with 1 ad, 1 pd, 1 p near middle, 1 p at distal one-third, and 5 preapical setae; mid tibia brown with 1 a at distal one-third, 2 pd near middle, 1 p at distal one-third and 4–5 preapical setae; hind tibia brown with 3 ad in basal half, 3 pd at basal one-fourth to three-fourths and 5 apical and preapical setae; fore tarsi light brown.

Abdomen: tergites black and shining, covered by short setulae and each with lateral and posterior setae; sternite III longitudinally rectangular; sternite IV wider; sternite V ( Fig. 25 ) prominently bilobate (brown) posteriorly, covered by setulae apically; epandrium ( Figs 26, 27 ) well developed, covered by setulae and with several pairs of distinct setae posteriorly; surstylus ( Figs 26, 27 ) ventrally bifurcate into two lobes: anterior lobe rather slender, posterior lobe broad and rounded, with angle of both lobes less 90˚; cerci comparatively short, covered by setulae in upper half.

Length. Body, 7.6–7.8 mm; wing, 7.0– 7.2 mm.

Female. Unknown.

Distribution. Japan (Honshu).

Etymology. This new species is named after Dr. S. Shinonaga who first collected this species.

Remarks. This blackish new Cordilura belongs to the species group which has both long distal and apical scutellar setae on scutellum. This species is closely similar to C. kakaberrans Ozerov in general appearance and male surstyli, but differs from it in the following characteristics: mid and hind coxae with many black setulae; abdominal tergites clothed with blackish hairy setulae; angle of two ventral lobes of male surstylus less 90˚. In C. kakberrans , mid and hind coxae with many whitish hairy setulae; abdominal tergites clothed with whitish hairy setulae, each tergite with only several black marginal setulae posteriorly; angle of two ventral lobes of male surstylus more than 90˚.

Figures

FIGURES 24–27. Cordilura shinonagai sp. nov., holotype. 24, male adult, left lateral view; 25, male sternite V; 26, male terminalia, left lateral view; 27, male terminalia, posterior view.