Cladotanytarsus frontalis Wang & Zheng

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 : 7-8

Cladotanytarsus frontalis Wang & Zheng ( Fig. 7 )

Cladotanytarsus frontalis Wang & Zheng 1993: 5 ( Figs. 6 , 7 )

Material examined. Holotype, male, (BDN. No. 04813), Hainan Province, Xinglong County, 18.7N / 110.1E, V. 21. 1988. 3 paratype, males, (BDN. No. 0 4814, 0 4815, 04816) data as for holotype. Leg. X. Wang. 1 male (BDN. No. 04800), Inner Mongolia, Alashan, Bayanhaote county. VII.31.1987. Leg. X. Wang.

Diagnoses. The large frontal tubercle, the flexed posterior margin of the superior volsella and the bent digitus with a tapered, pointed apex distinguish this species from others in the genus.

Male imago (n =5)

Total length 1.90–2.30 mm, 2.04 mm. Wing length 0.94–1.30 mm, 1.06 mm. Total length/ wing length 1.77–2.02, 1.89. Wing length/profemur length 1.88–2.43, 2.03. Coloration yellowish brown, with brown vittae on thorax.

Head. AR 0.76–0.96, 0.85 and ultimate flagellomere 290–360µm, 328 µm long. Temporal setae 4–5, 4 inner, 1–2, 2 outer verticals and 1–2, 2 postorbitals. Clypeus with 11–12, 12 setae. Tentorium 100–120 µm, 108 µm long, width 24–30µm, 26 µm. Palpomere lengths (in µm): 26–32, 29; 26–30, 28; 50–94, 70; 65–84, 77; 114–144, 130.

Wing. VR 1.02–1.23, 1.14 and Cu length 520–640 µm, 568 µm. Macrotrichia covering most of membrane, present on all veins except M and Cu. Number of setae on membrane cells: R4+5 64–72, 67; M1+2 91–97, 94; M3+ 4 22–28, 25; An 15–17, 16. Number of setae on veins: R 17–19, 18; R 1 12–15, 13; R4+ 5 10–20, 16; M1+ 2 27–34, 32; M3+ 4 17–20, 19; Cu 1 9–12, 11; Pcu 14–23, 19; An 11–14, 13.

Thorax. Acrostichals 4–10, 8; dorsocentrals 5–10, 7; prealars 1. Scutellum with 0–2, 2 setae.

Legs. Spur of front tibia 9–12µm, 10µm. Spurs of middle tibia 18µm long, and of hind tibia 20 µm and 18µm long. Combs of middle leg composed of 8 free teeth, of hind leg composed of 8 and 10 free teeth.

Lengths and proportion of legs (in µm):

Hypopygium. Anal point 40 µm. Phallapodeme 100 µm long. Transverse sternapodeme 60 µm long. Gonocoxite 114 µm long. Superior volsella 40 µm long. Digitus 24 µm. Inferior volsella 40 µm long. Stem of median volsella 24 µm long. Gonostylus 80 µm long. HR 1.43; HV 2.88.

Distribution. This species previously was known from Hainan Province (Oriental China). It is now also found in Inner Mongolia Autonomic Region (Palaearctic China). Remarks. The specimen from Inner Mongolia is larger than those from Hainan Province.

Figures

FIGURE 7. Hypopygium of Cladotanytarsus frontalis Wang & Zheng from Wang & Zheng 1993 (Fig. 6).

FIGURES 5 – 6. Cladotanytarsus dilatus sp. n. Holotype, male imago: 5. Wing, 6. Hypopygium.