Paratrichocladius bicinctus, Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2012

Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2012, A review of Paratrichocladius Santos Abreu from the Sino-Indian Region (Diptera: Chironomidae: Orthocladiinae), Zootaxa 3478, pp. 453-482 : 457-459

Paratrichocladius bicinctus sp. n.

( Fig. 3 A–E)

Type material. Holotype male, (BDN No. 12319), CHINA: Sichuan Province: Ganzi Autonomous State, Luding County, Wucigou (29°55’ N, 102°14’ E), alt. 2750 m, light trap, 7. vi. 1996, Xinhua Wang. Paratypes: 2 males, (BDN No. 12313, 12317), as holotype. Guangxi Autonomous Region: Longsheng County, Sanmen Town (25°43’ N, 109°52’ E), alt. 1954 m, light trap, 1 male, 27. v. 1990, Xinhua Wang (BDN No. 1768); Hainan Province: Changjiang County, Bawang Mountain (18°50’ N, 109°14’ E), alt. 533 m, light trap, 1 male, 11. v. 1989, Xinhua Wang (BDN No. 05724); Shandong Province: Yantai City, Muping District (37°16’ N, 121°32’ E), alt. 217 m, light trap, 1 male, 25. viii. 1988, Xinhua Wang (BDN No. 1760).

Diagnostic characters. The adult male can be separated from other members of the genus by having abdominal tergites II–III, VI–VIII dark brown and other tergites yellowish; setae on tergites IV–V distinctly reduced (11–12 setae as opposed to more than 20 in other tergites) in number; humeral pit absent; inferior volsella bilobed and well developed; and gonostylus with a very small crista dorsalis.

Etymology. From Latin, bicinctus , referring to the coloration of abdominal tergites.

Description. Adult male (n = 6)

Total length 2.15–2.68, 2.40 mm. Wing length 1.23–1.50, 1.35 mm. Total length / wing length 1.7–1.9, 1.8. Wing length / length of profemur 2.5–2.9, 2.7.

Coloration. Head dark brown, palp and antenna brown. Thorax yellowish brown to dark brown. Legs with femur of fore-, mid- and hind leg dark brown in basal 1/3; tarsomere 1 in apical 1/2 and tarsomere 2–5 of fore leg dark brown, other parts yellow. Abdominal tergites II–III, VI–VIII dark brown, other tergites yellowish.

Head. AR 0.83–0.98, 0.90, ultimate flagellomere 330–390, 349 µm long, with groove from the fourth flagellomere, apex without sensilla chaetica. Temporal setae 4–5, including 3 inner verticals, 1–2 outer verticals. Clypeus with 9–12, 10 setae. Tentorium 120–125, 123 µm long; 25–33, 29 µm wide. Stipes 120–125, 123 µm long; 5–8, 6 µm wide. Palpomeres length (in µm): 25–28, 27; 33–38, 36; 70–90, 80; 93–100, 96; 133–170, 152. Palpomere 5/3 1.5–2.3, 2.0.

Wing ( Fig. 3 A). Squama with 14–16, 15 setae, R with 4 setae. Costal extension 60–65, 63 µm long. VR 1.1–1.2, 1.15. Cu length 500–630, 560 µm. Cu/ wing length 0.41–0.43, 0.42. Wing width/ wing length 0.31–0.33, 0.32.

Thorax ( Fig. 3 B). Dorsocentrals 16–20, 18; acrostichals 8–12, 10; prealars 3. Scutellum with 16–20, 18 setae.

Legs. Spur of fore tibia 30–40, 36 µm long; spurs of mid tibia 15–18, 17 µm and 13–15, 14 µm long; of hind tibia 40–50, 43 µm and 15–20, 18 µm long. Hind tibial comb with 11–13, 12 setae. Width at apex of fore tibia 33–38, 35 Μm; of mid tibia 33–40, 36 m; of hind tibia 38–45, 41 Μm. Sensilla chaetica 8 on ta1 of P3. Lengths and proportions of legs as in Table 2.

Fe ti ta1 ta2 ta3 p1 450–7580, 510 600–7770, 698 370–7470, 435 225–7280, 260 160–7205, 189 p2 490–7640, 573 520–7650, 583 255–7310, 286 145–7175, 160 110–7130, 120 p3 480–7600, 533 560–7710, 633 325–7410, 366 180–7220, 201 135–7165, 154 continued.

ta4 ta5 LR BV SV BR p1 115–7145, 133 85–7105, 94 0.61–70.64, 0.63 2.4–72.5, 2.4 2.6–72.9, 2.8 1.5–71.9, 1.7 p2 70–780, 76 65–780, 75 0.48–70.53, 0.50 3.2–73.4, 3.3 3.8–74.2, 4.0 1.3–71.8, 1.6 p3 80–795, 84 75–780, 77 0.57–70.59, 0.58 2.9–73.1, 3.0 3.1–73.2, 3.2 1.8–72.5, 2.1 Abdomen ( Fig. 3 C). Tergites II–III very setose, distinctly fewer on tergites IV–VI. Setae on tergites I–IX as illustrated.

Hypopygium ( Fig. 3 D–E). Laterosternite IX with 6–8, 7 long setae. Phallapodeme 45–50, 48 Μm long; transverse sternapodeme 90–103, 95 Μm long, with oral projections. Gonocoxite 155–175, 170 Μm long; with more than 12 long setae. Superior volsella small, rounded. Inferior volsella bilobed. Gonostylus 80–85, 82 Μm long, with small crista dorsalis. Megaseta 8–10, 9 µm long. HR 1.9–2.2, 2.1; HV 2.6–3.2, 2.9.

Distribution. The specimens were collected in subtropical areas in Sichuan and Hainan Provinces, Guangxi Autonomous Region, Oriental China; Shandong Province, Palaearctic China.

Figures

FIGURE 3. Paratrichocladius bicinctus sp. n., male. A— Wing. B— Notum. C— Tergites I – IX. D— Hypopygium, dorsal view. E— Hypopygium, ventral view.