Parametriocnemus vittatus, Li, Xing, Lin, Xiao-long & Wang, Xin-hua, 2013

Li, Xing, Lin, Xiao-long & Wang, Xin-hua, 2013, New species and records of Parametriocnemus Goetghebuer from China (Diptera, Chironomidae), ZooKeys 320, pp. 51-62 : 58-60

Parametriocnemus vittatus sp. n. Figs 7-11

Type material.

Holotype male (BDN No.11836), CHINA: Sichuan Province, Shimian County, Sala River, 29°13'40"N, 102°21'34"E, 16.vi.1996, sweep net, X. Wang.

Diagnostic characters.

The male differs from other members of the genus by having a low AR, and tergites II–III with brown vita, tergites IV–V with three brown patches, and tergites VI–VII all brown. Ultimate flagellomere is expanded in the middle, tapering toward apex, with 4 long, curved sensilla chaetica subapically.

Etymology.

From Latin, noun, vitta - meaning ribbon, referring to tergites II–VII having brown vita.

Description.

Male (n=1).

Total length 2.55 mm. Wing length 1.43 mm. Total length / wing length 1.58. Wing length / length of profemur 2.30.

Coloration. Head, legs and antenna brown. Thorax light brown. Abdomen yellowish, tergites II–III with brown vita, 2/3 the width of the tergite, tergites IV–V with three brown patches on each tergite, and tergites VI -VII all brown (Fig. 7).

Head. AR 0.58. Ultimate flagellomere expand in the middle, tapering toward apex, with 4 long, curved sensilla chaetica subapically (Fig. 8). Temporal setae 9, including 4 inner verticals, 4 outer verticals and 1 postobital. Clypenus with 13 setae. Tentorium 110 µm long, 10 µm wide. Length of palpomeres (in µm): 23, 30, 85, 105, 160. Length ratio of palpomere 5/3 1.88.

Wing (Fig. 9). Anal lobe reduced. VR 1.22. Costal extension 120 µm long. Brachiolum with 1 seta, R with 20, R1 with 9, R4+5 with about 300, M without setae, M3+4 with 17 setae. Most of the wing membrane densely covered with setae; cell r4+5 with 141 setae, m3+4 with 13 setae. Squama with 8 seta.

Thorax. Antepronotum with 1 setae. Dorsocentrals 10, acrostichals 13, prealars not visible. Scutellum with 8 setae.

Legs. Spur of fore tibia 33 µm long, spurs of mid tibiae 23 µm and 20 µm long, of hind tibia 50 µm and 18 µm long. Width at apex of fore tibia 35 µm, of mid tibia 40 µm, of hind tibia 50 µm. Comb of 10 setae, shortest seta 28 µm long, longest seta 60 µm long. Lengths (in µm) and proportions of legs as in Table 5.

Hypopygium (Figs 10-11). Tergite IX including anal point with 5 setae. Laterosternite IX with 6 setae. Anal point 38 µm long, 33 µm wide. Gonocoxite 208 µm long, inferior volsella triangular. Gonostylus 75 µm long, megaseta 13 µm long. HR 2.77, HV 3.4.

Remaks.

The new species is similar to Parametriocnemus stylatus in the structure of the hypopyium, while the body color is close to Parametriocnemus scotti . However, both Parametriocnemus stylatus and Parametriocnemus scotti lack brown vita on tergites II–VII.

Distribution.

The species was collected in Sichuan Province in Oriental China.