Cladotanytarsus nigrovittatus (Goetghebuer)

Wang, Xinhua & Guo, Yuhong, 2004, A review of the genus Cladotanytarsus Kieffer from China, with the description of three new species (Diptera: Chironomidae: Tanytarsini), Zootaxa 750, pp. 1-19 : 8-9

Cladotanytarsus nigrovittatus (Goetghebuer) ( Fig. 8)

Tanytarsus nigrovittatus Goetghebuer 1922

Cladotanytarsus nigrovittatus (Goetghebuer) ; Fittkau & Reiss 1978: 436, Lindeberg 1964: 75 ( Fig. 3), Pinder 1978: 142 (Fig. 173D), Wang & Zheng 1993: 6 ( Figs. 10, 11 )

Material examined. 3 males, China, Shenyang Province. V.1989 (BDN. No. 20272), V.17.1992 (BDN. No. 20273), V. 1990 (BDN. No. 20274), Leg. Juncai Wang. 2 males, Liaoning Province, Fushun County, IV.1993 (BDN. No. 20275), IV.1989 (BDN. No.

20276) Leg. Juncai Wang. 1 male, China, Ningxia Autonomous Region, Yinchuan, VIII.2.1987 (BDN. No. 019). 1 male, Neimeng, Alashan Bayanhote, VII.30.1987 (BDN. No. 018), Leg. Wang.

Diagnosis. The palmate median volsella, bent digitus and less than five spinules on the anal point distinguish this species from others in the genus.

Male imago (n =7)

Total length 2.00– 3.26 mm, 2.78 mm. Wing length 1.10–1.50 mm, 1.34 mm. Total length/ wing length 1.73–2.26, 1.94. Wing length/profemur length 2.34–2.73, 2.51. Coloration yellowish brown, with brown vittae on thorax.

Head. Ultimate flagellomere 288–400 µm, 388 µm long. AR 0.80–1.10, 0.96. Temporal setae: 4–5, 5 inner, 1–3, 2 outer verticals and 1–3, 2 postorbitals. Clypeus with 11–15, 13 setae. Tentorium 100–140µm, 119 µm long, width 20–50µm, 37µm. Palpomere lengths (in µm): 22–48, 34; 24–36, 31; 74–110, 95; 76–120, 103; 102–200, 148.

Wing. VR 1.16–1.28, 1.21 and Cu length 520–696 µm, 632 µm. Macrotrichia on membrane (n =4): R4+ 5 11–48, 23; M1+ 2 3–66, 23; on veins as: R 4–15, 10; R4+ 5 1–16, 8; M1+ 2 4–33, 18. Anal lobe oblique.

Thorax. Acrostichals 4–6, 5; dorsocentrals 6–8, 7; prealars 0–1, 1. Scutellum with 0– 6, 4 setae.

Legs. Spur of front tibia 14–16 µm, 15µm. Spurs of middle tibia 16–26 µm, 20 µm and 12–23 µm, 18µm long, and of hind tibia 15–26 µm, 22 µm and 22–36 µm, 27µm long. Combs of middle leg composed of 5–10, 8 and 8–14, 10 free teeth, of hind leg composed of 9–11, 10 and 6–10, 8 free teeth.

Lengths and proportion of legs (in µm):

Hypopygium ( Fig. 8) Tergite IX with 7–17, 12 setae. Anal point 40–50 µm, 45 µm long. Phallapodeme 75–122µm, 102 µm long. Transverse sternapodeme 60–122 µm, 96µm long. Gonocoxite 116–176 µm, 147 µm long. Superior volsella 30–50 µm, 40 µm long. Digitus 22–38 µm, 32 µm long. Inferior volsella 45–68 µm, 56 µm long. The stem of median volsella 50–90 µm, 66 µm long. Gonostylus 70–100 µm, 88 µm long. HR 1.56– 1.91, 1.67; HV 2.56–3.71, 3.16.

Distribution. This species is widely distributed in Europe and northern China, showing a typical Palaearctic distribution.

Figures

FIGURES 10 – 11. Cladotanytarsus paratridorsum sp. n. Holotype, male imago: 10. Wing, 11. Hypopygium.