Dinera sichuanensis, Zhang & Shima, 2006

Zhang, Chun-Tian & Shima, Hiroshi, 2006, A systematic study of the genus Dinera Robineau-Desvoidy from the Palaearctic and Oriental regions (Diptera: Tachinidae), Zootaxa 1243 (1243), pp. 1-60 : 46-48

Dinera sichuanensis sp. nov.

Figs. 52–55

Diagnosis

Medium­sized black fly; thoracic scutum brown to dark brown, 3+3 dc, basicosta reddish yellow, abdomen with dark triangular band on posterior portion of tergites 3 to 5, syntergite 1+2 excavated to posterior 1/2–2/3, without median marginal seta, tergites 3 and 4 without median discal setae.

Body length 6.5–7.8 mm.

Description

Male. Head black in ground color, face brown and gena reddish brown, with yellowish gray pruinosity, frontal vitta and antenna black; palpus gleaming black. Frons strongly narrowed upward, at the narrowest point about twice width of anterior ocellus; frontal vitta strongly narrowed in front of ocellar triangle and nearly linear; parafacial slightly widened below, 2.5–3 times as wide as flagellomere 1 at middle height; lower margin of face strongly protruding forward, facial carina high and arched in lateral view; gena about 0.6 eye height. Fronto­orbital plate and parafacial bare; inner vertical seta slender, hair­like, about 2/5 eye height, slightly longer than postocellar seta; outer vertical seta indistinct; 10–12 inclinate frontal setae, of almost equal length and as long as ocellar seta, about 1/2 eye height; vibrissa inserted above lower margin of face by about length of pedicel. Antennal base slightly above level with lower 1/4 of eye height; antenna falling short of lower margin of face by 0.7–1.0 times length of flagellomere 1; flagellomere 1 2.0–2.5 times as long as pedicel; arista short plumose, including plumosity about as wide as flagellomere 1. Prementum slender, slightly longer than palpus.

Thorax black, with brown to dark brown pruinosity on scutum and brownish gray on postpronotal lobe and pleura; dorsum with 5 narrowly black longitudinal vittae; scutellum with grayish brown pruinosity, dark brown on central and basal region. Postpronotum with 2–4 setae; 1+2 ac, 3+3 dc; 0+2 ia; 3 sa; 2+1 katepisternal setae. Scutellum with subapical seta as long as scutellum; apical scutellar setae strong and crossed, 1.5 times as long as scutellum. Wing hyaline, faintly and evenly tinged with pale brown; tegula black and basicosta reddish yellow; lower calypter yellowish white; halter yellow, brownish on basal portion. Costal spine absent; relative length of costal sections second, third and fourth approximately as 2:4:3; crossvein r­m thick, vein M from dm­cu crossvein to its bend about twice as long as distance between the bend and wing margin; cell r 4+5 narrowly open. Legs black, pulvilli yellowish, claw about as long as tarsomere 5. Fore tibia with 2 p and 1 preapical pv; mid tibia with 1 ad and 2–4 p, without v; hind tibia with 2–4 av, 3–4 ad and 3–4 pd, apical av short but distinct, 2 apical d.

Abdomen long ovate, black in ground color, with yellowish gray pruinosity; dark brown on syntergite 1+2; sometimes thin pruinosity on sides, triangularly dark on posterior 2/3–4/5 of tergite 3, 1/3–2/3 of tergite 4, and dark on posterior 1/5–1/3 of tergite 5. Syntergite 1+2 excavated to posterior 1/2–2/3, without median marginal seta, with 2–3 lateral marginal setae; tergite 3 with 2 median marginal and 3–4 lateral marginal setae; tergite 4 with a row of marginal setae; tergite 5 with an irregular row of discal setae on posterior portion and a row of marginal setae. Sternite 5 wide, median cleft deep and wide, about 2/3 as wide as long, posterior lobe blunt and rounded. Male terminalia large, cerci slender, strongly narrowed on apical half, evenly bent ventrally, pointed apically, surstylus bluntly rounded in dorsal view; pregonite long and bent posteriorly, postgonite shorter than basiphallus; distiphallus slender, membranous apical part about twice as long as sclerotized basal part, with minute spinules on membranous basal part ventrally.

Female. Differing from male as follows: Vertex about 2/5 head width; frontal vitta widened anteriorly, about 1.2 times as wide as fronto­orbital plate; gena about as long as eye height; inner vertical seta strong, about as long as ocellar seta; outer vertical seta about 3/5 as long as inner vertical seta; 2 outwardly directed prevertical setae, 4 proclinate orbital setae; 5–7 inclinate frontal setae; mid tibia with 2 av, 2 ad and 3 pd; claw and pulvillus shorter than tarsomere 5; abdomen ovate.

Type material

Holotype ♂, CHINA, Mt. Jiajin, 4000–4600 m, Ganzi Prefecture , Sichuan, 4.viii.2005, L. Chang ( SNUC) . Paratypes CHINA. 8 males, 1 female, L. Chang , 1 male, M.­f. Wang, 1 male, J.­y. Liu, same locality and date as holotype ( SNUC) .

Etymology Specific epithet is taken from the type locality. Remarks

This species resembles D. alticola , but differs from it in having 5 narrowly black longitudinal vittae on thoracic dorsum, mid tibia without v seta, and lower calypter yellowish white. It also differs from D. maculosa in having scutullum dark black except yellowish brown on marginal region, 3+3 dc, and abdominal tergites each with a dark triangular band.