Dinera borealis, Zhang, Chun-Tian & Fu, Chao, 2012

Zhang, Chun-Tian & Fu, Chao, 2012, Three new species of Dinera Robineau-Desvoidy from China (Diptera: Tachinidae), Zootaxa 3275, pp. 20-28 : 21

Dinera borealis sp. nov.

( Figs. 1–2 , 7–11 )

Diagnosis. Facial carina low and indistinct, prementum 5–7 times as long as wide, abdomen mostly black, with brown on side and venter, syntergite 1+2 without median marginal setae.

Description. Body length 12.0–15.0 mm.

Male. Head black in ground color, gena reddish brown; fronto-orbital plate, parafacial and gena with grayish white pruinosity; frontal vitta black; lunula brown; antenna reddish brown except apical 4/5 of flagellomere 1 and arista dark brown; palpus reddish yellow. Frons at narrowest point 1/8–1/7 of head width; frontal vitta widened anteriorly, 1.3–1.5 times as wide as fronto-orbital plate at middle; parafacial 2–3 times as wide as flagellomere 1 at middle height in lateral view; genal height 0.4–0.5 as wide as eye height; facial carina low and indistinct. Frontoorbital plate sparsely with 4–6 small black hairs; parafacial bare; 10–11 inclinate frontal setae; inner vertical seta about 0.4 times as long as eye height; outer vertical seta absent; ocellar seta strong, proclinate, longer than inner vertical seta; vibrissa situated slightly above lower margin of face; occiput with 2 rows of black hairs behind postocular setae. Antenna falling short of lower margin of face by 0.8–1.0 times length of flagellomere 1; flagellomere 1 about 3 times as long as wide; pedicel with a long seta which is about as long as arista; arista including plumosity 1.5–2 times as wide as flagellomere 1; palpus about as long as prementum; prementum 5–7 times as long as wide.

Thorax black in ground color, with grayish yellow to gray pruinosity; scutum with 5 black longitudinal vittae on presutural scutum, inner vittae extending to anterior 1/4 of postsutural scutum and the median vitta extending to anterior 3/4 of postsutural scutum; outer vitta about 1/4–1/5 as wide as pruinose portion between inner and outer vittae; postpronotal lobe, scutellum, postalar callus dark brown, with grayish white pruinosity; pleura black, with grayish white pruinosity. Prosternum 3–4 times as long as wide; postpronotal lobe with 5–6 setae, 3 strong basal setae arranged in a triangle; 2 presutural and 2 postsutural acrostichal setae, 3 presutural and 4 postsutural dorsocentral setae, 3 supra-alar setae and the 1st seta as long as notopleural seta; 3 katepisternal setae; anepimeron with 1–2 strong setae; a row of discal scutellar setae; apical scutellar setae about as long as scutellum, subapical scutellar seta longer than apical scutellar seta. Wing hyaline, evenly and slightly tinged with pale brown; tegula black; basicosta reddish yellow to brown; lower calypter pale yellowish white; halter yellow. Costal spine absent; bend of vein M with a short appendix; relative length of costal sections 2nd, 3rd and 4th approximately as 4:7:3; vein M from dm-cu crossvein to its bend 2–2.5 times as long as distance between the bend and wing margin. Legs black; pulvilli brownish yellow, fore claws and pulvilli longer than 5th tarsomere of fore leg; fore tarsi distinctly longer than head height; fore tibia with a row of anterodorsal setae on the basal 2/3, 2–3 posterodorsal setae, 2 ventral setae; mid tibia with 2–3 anterodorsal?2–3 posterodorsal and 1 ventral setae; hind tibia with 4–5 anterodorsal setae on the basal 2/3, 2–3 posterodorsal setae, 2 ventral setae.

Abdomen long ovate, mostly black in ground color, with brown on side and venter, dense grayish white pruinosity on whole tergites; dark longitudinal median portion on tergite 3. Syntergite 1+2 excavated to posterior margin, without median marginal setae, with 1–2 lateral marginal setae; tergite 3 with 1 pair of median marginal setae, 1–2 lateral marginal setae; tergites 4 and 5 each with a row of strong marginal setae; tergites 3 and 4 without discal setae; tergite 5 with a row of discal setae; recumbent black hairs on tergites. Sternite 5 nearly rectangular, lateral lobe broad and rounded apically, V-shaped median cleft deep and wide, about 2/3 length of the sternite. Apical 2/3 of cerci distinctly narrowed and pointed, cerci shorter than surstylus in caudal view, apex bent ventrally in lateral view; surstylus broad, rounded apically; pregonite long and bent posteriorly; postgonite shorter than basiphallus; distiphallus long, sclerotized basal part with small spines on ventral surface, shorter than membranous apical part.

Type material. Holotype 3, CHINA, Liaoning: Heshangmaozi (41°12ʹN 124°30ʹE), 600–1200 m, Tanggou, Benxi, 23.vii.2008, Y. Zhi. Paratype. CHINA, Liaoning: 1 male, same data as holotype ( SYNU).

Etymology. Specific epithet is named for the northern location of the type locality, borealis meaning northern in Latin.

Distribution. China (Liaoning).

Remarks. This species is treated in Dinera by having narrow frons, fronto-orbital plate sparsely with 4–6 hairs, fore tarsi distinctly longer than head height, and hind tibia with 4–5 irregular anterodorsal setae in length. It is distinguished from other species of Dinera in having a low and indistinct facial carina and abdomen brown on side and venter.

Figures

FIGURES 1 – 6. Male in dorsal and lateral view. 1 – 2. Dinera borealis sp. nov. 3 – 4. Dinera guangxiensis sp. nov. 5 – 6. Dinera nigrisquama sp. nov.

FIGURES 7 – 11. Dinera borealis sp. nov. 7. Head of male in lateral view. 8 – 9. Epandrium, cerci and surstyli in caudal and lateral views. 10. Aedeagal apodeme, ejaculatory apodeme, hypandrium, pregonite, postgonite, basiphallus and distiphallus in lateral view. 11. Sternite 5. Scale bars = 0.25 mm.