Helina mesolobata 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 : 583-585

Helina mesolobata Xue and Tian sp. nov.

( Figure 8A–D )

Type material

Holotype. One male ( IESNU), China, Mount Gaoligong , Yunnan province, 28 ◦ 22 ′ N, 98 ◦ 50 ′ E, altitude 2500 m, 17 July 2008, X.S. Zhang.

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

Etymology

The specific name is derived from Greek, because this species has a flap on sternite 5, using the Greek words mesos plus lobat.

Distribution

China, Yunnan Province, Mount Gaoligong.

Remarks

This new species resembles Helina hirtisurstyla Feng, 2000 , but differs from it in having the pra absent, legs entirely black, mid femur with one av, sternite 5 with flap.

Description (based on holotype)

Male. Body length 5.8–6.0 mm.

Colour: Frontal vitta black, fronto-orbital plates and parafacials covered with light grey pruinosity, antennae black, lunule fuscous, genal and postgena setae black, the upper lateral area of the occiput with black hairs, palpus black. Thorax groundcolour black, with light grey pruinosity, hind scutum brown grey pruinose, hind half of hind scutum with light brown middle vitta, anterior and posterior spiracles black brown. Wing hyaline, basal half of longitudinal veins brownish-yellow, apical half brown; basicosta light brown, calypters yellowish, haltere brown. Legs entirely black. Abdomen ground-colour black, covered with dense brown grey to grey pruinosity, tergites 3–5 each with a pair of black brown spots and fuscous middle vittae.

Head: Eye bare; frons about twice as wide as anterior ocellus, frontal vitta subequal with or wider than one side of fronto-orbital plate; six or seven pairs of frontal setae, without orbital seta; parafacial about subequal with or narrower than postpedicel (basal part of pedicel about as wide as postpedicel); postpedicel about 2.5 times as long as broad, arista long plumose, the longest hairs about 1.2–1.3 times as wide as postpedicel; vibrissal angle situated behind frontal angle in profile; genal height about one-fifth of eye height, upper margin of gena with a row of regular upcurved peristomal setae; proboscis short, prementum slight pruinosity, slightly shiny, twice as long as high, palpus longer than prementum; labella large, about two-thirds length of prementum.

Thorax: Scutum with four black vittae, the median pair reaching scutoscutellar suture, acr 0+1, dc 2+4, ial 0+2, pra absent; lower surface and lateral margins of scutellum bare; notopleuron, anepimeron, katepimeron and meron bare, proepisternal seta 1, with small hairs nearby; upper proepimeral seta 1, with three small hairs nearby; anterior anepisternal seta 1, katepisternal setae 2+2.

Wing: Costal spine longer than cross-vein r-m, Sc bow-shaped, radial node bare, cross-veins r-m and dm-cu unclouded.

Legs: Fore tibia without median p; mid-femur with one av on middle, with five distinct pv in basal half, the basal two or three long; mid-tibia with four p, without pv; hind femur with integrated av rows, about five long in apical half, two rows of them cilia-like in basal two-thirds, the middle about 3.0 times as long as the diameter of hind femur, with short ciliae-like setae in basal ventral part; hind tibia with three av, three or four ad, with bristle rows on middle hind, sub-basal part with one or two short small pd, without apical pv; tarsi longer than tibiae, claws equal to pulvilli, about four-fifths length of the fifth tarsomere.

Abdomen: Conical in shape, tergites 4 and 5 with strong discal bristles, setae with distinct setigerous spots (without pruinosity nearby), sternite 1 bare, sternite 5 with flap, flap with three or four long setae in apical area, margin with dense fuzz.

Female. Unknown.

Figures

Figure 8. Helina mesolobata 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.