Cladopelma costum, Yan, Chuncai, Jin, Zhaohui & Wang, Xinhua, 2008

Yan, Chuncai, Jin, Zhaohui & Wang, Xinhua, 2008, Cladopelma Kieffer from the Sino-Indian Region (Diptera: Chironomidae), Zootaxa 1916, pp. 44-56 : 46-48

Cladopelma costum sp. n.

( Figs 1–3 )

Type material: Holotype male (BDN no. 06495), CHINA: Shaanxi Province: Xiangcheng County, Zhouzhi Town, Banfangzi, 10.viii.1994, light trap, W. Bu. Paratypes: 1 male, data as for holotype; 1 male, Chongqing Municipality, Nanchuan Town, Sanquan, 10.v.1986, sweep net, X. Wang; 1 male, Gansu Province, Tianshui City, Xiaolongshan Dangchuan, 1450 m a.s.l., 7.x.1993, light trap, W. Bu.

Diagnostic characters: The new species is easily distinguished from other known species in the genus by having reduced and bare superior volsella; anal point with a distinct high bare ridge; and medially swollen gonostylus.

Etymology: From Latin costa, ridge, referring to the anal point which has a high ridge.

. Description: Male (n = 4, unless otherwise stated). Total length 3.65–4.20, 3.96 mm. Wing length 1.98– 2.45, 2.19 mm. Total length / wing length 1.71–1.88, 1.82. Wing length / length of profemur 1.98–2.18, 2.06.

Coloration. Thorax yellowish brown to dark brown. Foreleg dark brown except basal 9/10 of femur yellowish green; mid and hind legs yellowish green except distal 1/3 of ta1 and ta2–5 dark brown. Abdomen with tergites I–V pale yellowish green and tergites VI–VIII yellowish brown, hypopygium dark brown.

Head. AR 2.38–2.66, 2.53; ultimate flagellomere 810–930, 888 Μm long. Frontal tubercles cylindrical, 10–12 (2) Μm long; 6–7 (2) Μm wide. Temporal setae 12–13 (2), including 1 (2) inner vertical, 5–6 (2) outer verticals, and 5–7 (2) postorbitals. Clypeus with 14–18, 17 setae. Tentorium 120–135 (3) Μm long, 25–35 (3) Μm wide. Palpomere lengths (in Μm): 45–50, 48; 50–62, 54; 175–200, 186; 175–200, 192; 275–320, 293. Palp segment 5/3 1.45–1.70, 1.58.

Thorax. Antepronotals 2–5, 4; acrostichals 8–12, 10; dorsocentrals 8–12, 10; prealars 5–7, 6. Scutellum with 22–28, 24 setae.

Wing ( Fig. 1 ). VR 1.07–1.12, 1.10. R with 18–22, 20; R1 with 16–17, 17; R4+5 with 20–24, 23 setae. Brachiolum with 2–3, 3 setae. Squama with 11–15, 13 setae. Anal lobe strongly produced.

Legs. Foretibia with 3 subapical setae, 130–136, 133 Μm, 140–145, 142 Μm, and 145–160, 149 Μm long. Spurs of midtibia 25–33, 27 Μm and 30–40, 37 Μm long; comb with 30–42, 37 teeth, 10–11, 10 Μm long. Spurs of hind tibia 25–35, 30 Μm and 43–50, 48 Μm long; comb with 48–52, 51 teeth, 11–12, 12 Μm long. Sensilla chaetica of mid legs absent. Lengths (in Μm) and proportions of legs as in Table 1 .

Hypopygium ( Figs 2–3 ). Posterior margin of tergite IX with large process flanking anal point, bearing 16– 26, 19 setae and microtrichia. Laterosternite IX with 3–5, 4 setae. Anal point cone-shaped with high, bare ridge; 78–110, 91 Μm long; covered with microtrichia and with 12–16, 15 lateral setae. Superior volsella reduced, bare. Anal tergite bands V-shaped, joined medially. Phallapodeme 83–105, 94 Μm long. Transverse sternapodeme 20–38, 27 Μm long. Gonocoxite 125–155, 139 Μm long; with 7–10, 8 strong setae along inner margin. Gonostylus 180–192, 186 Μm long; strongly swollen medially, tapering towards apex; bearing 10–14, 12 setae along inner margin. HR 0.69–0.82, 0.75; HV 2.03–2.19, 2.13.

Distribution: The species is taken in Shaanxi, Gusu Province and in Chongqing City in China.

fe ti ta1 ta2 ta3 ta4 ta5 LR

Figures

FIGURES 1 – 3. Cladopelma costum sp. n., male. 1 - wing; 2 - hypopygium, dorsal view; 3 - hypopygium, ventral view.