Helina longievecta Xue, 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 : 1556-1558

Helina longievecta Xue , sp. nov.

( Figure 2A–D )

Type material

Holotype. One male ( IESNU), China, Forestry centre of Guamagou , Ningxia Hui Autonomous Region , 38°28' N, 106°15' E, altitude 2200 m, 6 July 2008, J.Y. Liu.

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

Etymology

The specific name is based on the similarity of new species with Helina evecta ( Harris, 1780) , with arista length of the former more than twice width of postpedicel, the latter subequal to the width of postpedicel.

Distribution

China, Ningxia Hui Autonomous Region, Forestry centre of Guamagou.

Remarks

This new species is similar to H. evecta ( Harris, 1780) , but differs from it as follows: parafacial about 1.2 times as broad as postpedicel; the longest aristal hairs about 2.2– 2.5 times as long as the width of postpedicel; cross-veins r-m and dm-cu indistinctly clouded; tergite 5 with a pair of small patches.

Description (based on holotype)

Male. Body length 6.9–7.2 mm.

Head. Eyes with dense, medium long and orange ciliae; frons about twice as broad as anterior ocellus; frontal vitta black, linear at narrowest point; 6–7 pairs of fr on lower half of frons, without ors; ocellar seta shorter than the lower fr length; fronto-orbital plate and parafacial with light grey pruinosity, parafacial about 1.2 times as broad as postpedicel; antenna black, postpedicel thin and long, length about 2.5 times longer than width; arista long plumose, the longest hairs about 2.2–2.5 times as long as the width of postpedicel; lunule brownish; epistoma not proeminent; vibrissal angle situated behind frontal angle; anterior margin of gena with one row of upcurved setulae, genal and postgenasetulae black; gena with grey pruinosity, genal height about two-ninths of eye height; epicephalon with black hairs; proboscis short, with grey pruinosity, length about twice as long as its height; labella large, posterior part of labella extended in posterosuperior direction, about four-fifths of prementum length; palpus black, about 1.3 times as long as prementum.

Thorax. Ground-colour black, with light grey pruinosity; scutum with four black vittae, inner vitta reaching the middle of postsutural area of scutum; acr 0+1, dc 2+4, ial 0+2, pra about two-fifths to a half of posterior notopleural seta in length, posthumeral seta 1+0; posterior notopleural seta with many setulae around base; lateral surface and ventral lateral margin of scutellum with black hairs; basisternum of prosternum, proepisternum hollow in centre, anepimeron and katepimeron all bare; meron with many black hairs; anterior anepisernal seta 1, katepisternal setae 2+2; anterior and posterior spiracles large and orange.

Wing. With a light orange colour, basicosta yellow; costal spine short, Sc bowshaped, radial node bare, R 4+5 and M straight, slightly diverging in distal part, cross-veins r-m and dm-cu indistinctly clouded; calypters yellowish, lower calypter tongue-shaped protruding, haltere yellow.

Legs. Completely black; fore tibia without median p; mid femur without distinct av, with anterior setiform row in basal half, pv row complete, shorter towards apex; mid tibia with 2–3 p; hind femur with av row complete, distinctly strong towards apex, distinctly short and fine in sub-basal part, only with 2–3 pv in apical part; hind tibia with 3–4 av, 2 ad, posterior setiform row in basal half, without pv; tarsi longer than tibiae, claws and pulvilli long and large, subequal to tarsomere 5 in length.

Abdomen. Ground-colour black, oval in dorsal view, with dense and greyish pruinosity; tergites 3–5 each with a pair of black patches; posterior marginal row of setae complete; body hairs dense and short, without shifting patches or with very indistinct shifting patches; patches on tergite 5 small, discal setae longer than posterior marginal setae, sternite 1 with hairs.

Female. Unknown.

Figures

Figure 2. Helina longievecta Xue, 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.