Helana longisurstyla Xue and Sun, 2014

Xue, Wanqi & Sun, Hongkui, 2014, Diagnosis and key for the Helina annosa-group (Diptera: Muscidae) from China, with descriptions of nine new species, Journal of Natural History 49 (25), pp. 1549-1583 : 1559-1561

Helana longisurstyla Xue and Sun , sp. nov.

( Figure 3A–D )

Type material

Holotype. One male ( IESNU), China, Snow Mount Biluo , Yunnan Province, 26° 57' N, 99°01' E, altitude 2300–2400 m, 13 May 2012, Y. Zhao.

Paratypes. One male ( IESNU), same data as holotype .

Etymology

The specific name is based on the long male surstylus.

Distribution

China, Yunnan Province, Snow Mount Biluo.

Remarks

This new species is similar to H. baoshanensis , but differs from it as follows. Ciliae of eyes shorter; anterosuperior facet distinctly enlarged; frons narrower than anterior ocellus in width; parafacial distinctly narrower than antenna in width; the length of postpedicel about 4.5–4.8 times as long as its width; inner black vitta of scutum broader, not reaching scutoscutellar suture; mid femur with 3–4 pv; hind tibia with 5 av in medial one-third; inner protuberance of male cercus longer, without outer protuberance; cercus longer in profile view, length about twice as long as width.

Description (based on holotype)

Male. Body length 8.4–8.6 mm.

Head. Eyes with median long and orange hairs, anterosuperior facet enlarged; frons about 1.2 times as broad as anterior ocellus; frontal vitta linear in upper half; 7 pairs of fr on lower half of frons; fronto-orbital plate and parafacial with grey pruinosity; fronto-orbital plate subequal to antenna in width; antenna black, the length of postpedicel about 4.5–4.8 times as long as its width; arista long plumose, the longest hairs about 2.5 times as long as the width of postpedicel; genal height about twoninths of eye height; genal and postgena setulae black; proboscis short; length of prementum about 2.5 times as long as its height; palpus black, longer than prementum.

Thorax. Ground-colour black; scutum with dense and blue grey pruinosity and four black vittae, inner vitta not reaching scutoscutellar suture, about three-fifths width of the median and pale vitta; acr 0+1, dc 2+4, pra about three-fifths length of posterior notopleural seta; notopleuron, meron, lateral surface and ventral lateral margin of scutellum with black hairs; basisternum of prosternum and katepimeron all bare; anterior anepisernal seta 1, katepisternal setae 2+2.

Wing. Transparent, veins orange yellow, basicosta yellow; costal spine absent; dm-cu S-shaped; radial node bare; R 4+5 and M diverging in distal part; calypters yellowish; haltere yellow.

Legs. Completely black; fore tibia without median p; mid femur with pv row complete, shorter towards basal half; mid tibia with 3 p; hind femur with av row in apical one-third, without pv; hind tibia with 5 av, 2 ad, posterior setula row (about 8) in subbasal to pre-apical, without pv.

Abdomen. Ground-colour black, with grey to orange grey pruinosity; sub-circular in dorsal view; tergites 3 and 4 each with a pair of black brown patches; tergite 5 without distinct patches; each tergite without median vitta, with distinct shifting patches; tergite 3 with a pair of median marginal setae; body hairs denser, body

hairs of tergites 4 and 5 sparser; posterior marginal setae of tergite 5 thin and short; terminalia black; sternite 1 with hairs.

Female. Unknown.

Figures

Figure 3. Helina longisurstyla Xue and Sun, 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–D, 0.5 mm.