Helina yanzigouensis Xue and Tian, 2012

Xue, Wanqi & Tian, Xu, 2012, Thirteen new species of the genus Helina R. - D. (Diptera: Muscidae) from China, Journal of Natural History 46 (9 - 10), pp. 565-598 : 595-597

Helina yanzigouensis Xue and Tian sp. nov.

( Figure 13A–D )

Type material

Holotype. One male ( IESNU), China, Yanzigou , Sichuan province, 29 ◦ 92 ′ N, 102 ◦ 25 ′ E, altitude 2800 m, 17 July 2005, J.Y. Liu.

Paratypes. Two males ( IESNU), same data as holotype .

Etymology

The name of this species is based on the place of collection: Yanzigou.

Distribution

China, Sichuan Province, Yanzigou.

Remarks

The new species is similar to Helina yushuensis Sun, Sun and Ma, 1998 , but differs from the latter as follows: genal height about one-quarter of eye height, pra absent, legs all black, fore tibia with one median p; mid-tibia without ad row; sternite 5 quadrateshaped, surstyli broad.

Description (based on holotype)

Male. Body length 7.4–7.6 mm.

Colour: Frontal vitta black, parafacial covered with grey brown pruinosity, frontoorbital plate covered with light grey pruinosity, antenna black, lunule brown, genal and postgenal hairs black, palpus black. Thorax black in ground-colour, covered with light grey pruinosity, the middle of the scutellum with grey brown stripes. Wing light brown, veins brown, basicosta black, calypters light yellowish, haltere yellow. Legs all black. Abdomen ground-colour black, covered with dense and grey brown pruinosity, tergites 2 to 5 with a pair of dark brown lateral patches and median vittae.

Head: Eye bare; frons subequal with the distance between posterior ocelli in width, frontal vitta about 2.0 times as wide as fronto-orbital plate, seven pairs of frontal setae on lower three-fifths of frons, without ors; ocellar setae shorter than the lower frontal setae in length, inner vertical seta thin, outer vertical seta shorter than inner vertical seta in length, parafacial in centre about 1.5 times as wide as postpedicel; postpedicel about 2.5–2.8 times as long as broad, arista plumose, the longest aristal hairs subequal with or longer than postpedicel in width; vibrissal angle situated behind frontal angle in profile; genal height about one-quarter of eye height, anterior margin of gena with two rows of upcurved subvibrissal setulae; the upper lateral area of the occiput with hairs, prementum covered with pruinosity, about 2.5 times as long as broad, palpus about 1.3 times as long as prementum, both sides of peristoma with five pairs of hookshaped prestomal teeth.

Thorax: Scutum with four broad vittae, the middle black vitta longer than inner vitta in length, the inner vitta reaching scutoscutellar suture; four rows of prst-acr, acr 0+1, dc 2+4, ial 0+2, pra absent, postpronotal seta 2, posthumeral seta 1+0; notopleuron, lateral margin and lower surface of scutellum, basisternum of prosternum, proepisternum hollow in centre, anepimeron, katepimeron and meron all bare; upper proepisternal seta 1, katepisternal setae 2+2.

Wing: Costal spine short, shorter than cross-vein r-m in length, Sc curved as arcshaped, radial node bare; r-m and dm-cu cross-vein not clouded.

Legs: Fore tibia with one median p; mid-femur without av, with a complete pv, mid-tibia with three p, without ad row; hind femur with a complete and long fringeshaped av row and pv row, av longer than pv in length, the longest hair about 2.2 times as long as tibial diameter, hind tibia with three av, three ad, behind the middle with a row of long setae; the middle of post-ventral surface with four or five long setae, apically without pv; all tarsi longer than tibiae in length, claws and pulvilli long, subequal with fifth tarsomere in length.

Abdomen: Long cone-shaped in dorsal view, without shifting patches, seta-base covered with slight pruinosity, sternite 1 bare, sternite 5 quadrate-shaped, surstyli broad.

Female. Unknown.

Figures

Figure 13. Helina yanzigouensis sp. nov. (A) Male, abdomen in dorsal view; (B) male, sternite 5 in ventral view; (C) male, cerci in posterior view; (D) male, terminalia in profile. Scale bars: A, 1 mm; B, 0.5 mm; C,D, 0.2 mm.