Paratrichocladius aduncus, 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 : 454-456

Paratrichocladius aduncus sp. n.

( Fig. 1 A–E)

Type material. Holotype male (BDN No. 23475), CHINA: Hebei Province, Weichang County, Qipan Town (42°10’ N, 117°57’ E), alt. 1800 m, light trap, 18. vii. 2001, Yuhong Guo. Paratypes: 2 males (BDN No. 23445, 23386), as holotype; 2 males (BDN No. 13146, 13164); Sichuan Province: Kangding County, Wasigou (30°03’ N, 101°57’ E), alt. 3700 m, light trap, 15. vi. 1996, 7 males, Xinhua Wang (BDN No. 0 5412, 0 5410, 0 5377, 0 5408, 0 5414, 1185, 05411); Ningxia Autonomous Region: Guyuan City, Xumi Mountain (36°01’ N, 106°14’ E), alt. 1700 m, light trap, 28. viii. 1988, 1 male, Xinhua Wang (BDN No. 05376); Fujian Province: Shanghang County, Gutian Town (25°13’ N, 116°49’ E), alt. 1730 m, light trap, 1 male, 3. v. 1993, Xinhua Wang.

Diagnostic characters. Similar to P. hamatus Wang et Zheng in coloration, and posteriorly curved inferior volsella. It can be separated by a slightly lower AR (AR 1.0–1.4 as opposed to 1.5–1.7); humeral pit more or less triangular; an inferior volsella which is relatively more narrow basally, protruding medially, and strongly hooked posteriorly; and a gonostylus slightly expanded in basal 1/4 and with a rounded, sometimes indistinctly expanded crista dorsalis.

Etymology. From Latin, aduncus , bent inward, referring to the posteriorly strongly hooked inferior volsella.

Description. Adult male (n = 13)

Total length 2.6–3.8, 3.1 mm. Wing length 1.5–1.8, 1.7 mm. Total length / wing length 1.7–2.1, 1.9. Wing length / length of profemur 2.4–2.7, 2.5.

Coloration. Head dark brown, palp and antenna brown. Thorax dark brown. Legs yellowish brown. Abdominal yellowish brown to brown.

Head. AR 1.0–1.4, 1.2, ultimate flagellomere 430–600, 506 µm long, with groove from the fourth flagellomere, apex without sensilla chaetica. Temporal setae 10–13, including 6 inner verticals, 3 outer verticals, 2–3 postorbitals. Clypeus with 10–12, 11 setae. Tentorium 140–160, 149 µm long; 35–50, 40 µm wide. Stipes 150–170, 158 µm long, 8–10 µm wide. Palpomeres length (in µm): 33–40, 37; 48–68, 57; 88–118, 101; 100–138, 113; 150–198, 174. Palpomere 5/3: 1.6–1.9, 1.75.

Wing ( Fig. 1 A). Squama with 8–14, 12 fringe hairs, Brachiolum with 1 seta and 11–15, 13 sensilla campaniformia, R with 5–7, 6 setae. Costal extension 30–33, 32 µm long. VR 1.0–1.2, 1.1. Cu length 650–800, 704 µm. Cu/ wing length 0.40–0.44, 0.42. Wing width/ wing length 0.30–0.33, 0.32.

Thorax ( Fig. 1 B). Dorsocentrals 12–18, 14; acrostichals more than 6; prealars 3–4, 3. Scutellum with 6–8, 7 setae.

Legs. Spur of fore tibia 40–68, 55 µm long; spurs of mid tibia 20–30, 25 µm and 15–23, 18 µm long; of hind tibia 43–55, 50 µm and 10–15, 13 µm long. Hind tibial comb with 10–14, 12 setae. Width at apex of fore tibia 35–43, 40 Μm; of mid tibia 35–45, 38 Μm; of hind tibia 45–53, 50 Μm. Sensilla chaetica 8–15, 11 on ta1 of P3. Lengths and proportions of legs as in Table 1.

Fe ti ta1 ta2 ta3 p1 600–710, 652 760–950, 840 420–570, 484 280–350, 311 205–250, 222 p2 630–760, 680 670–790, 718 320–380, 340 185–215, 200 145–180, 154 p3 600–770, 662 780–960, 846 420–540, 470 230–280, 253 170–230, 199 continued.

ta4 ta5 LR BV SV BR p1 140–7160, 149 100–7115, 110 0.55–70.60, 0.57 2.4–72.6, 2.5 2.9–73.2, 3.1 2.0–72.4, 2.2 p2 105–7125, 110 98–7110, 103 0.46–70.49, 0.48 2.6–73.1, 2.9 4.0–74.2, 4.1 1.7–72.4, 2.1 p3 115–7145, 126 110–7125, 113 0.53–70.59, 0.56 2.7–73.0, 2.8 3.1–73.3, 3.2 2.0–72.7, 2.3 Abdomen ( Fig. 1 C). With many long setae. Setae on tergites I–VI as illustrated.

Hypopygium ( Fig 1 D–E). Laterosternite IX with 6–8, 7 long setae. Phallapodeme 60–80, 72 Μm long; transverse sternapodeme 110–130, 124 m long, with oral projections. Gonocoxite 200–215, 210 Μm long; with more than 18 long setae. Superior volsella weakly developed, rounded. Inferior volsella hook–shaped. Gonostylus 80–99, 90 Μm long, with crista dorsalis. Megaseta 13–15, 14 µm long. HR 2.2–2.6, 2.4; HV 2.9–3.9, 3.5. Distribution. The specimens were collected in subtropical areas in Sichuan and Fujian Provinces (Oriental China); Hebei Province and Ningxia Autonomous Region (Palaearctic China).

Figures

FIGURE 1. Paratrichocladius aduncus sp. n., male. A— Wing. B— Notum. C— Tergite I – VI. D— Hypopygium, dorsal view. E— Hypopygium, ventral view.