Cladotanytarsus paratridorsum, Wang, Xinhua & Guo, Yuhong, 2004

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 : 11-13

Cladotanytarsus paratridorsum sp. n. ( Figs. 10–11 )

Type material. Holotype male (BDN No. 04797), Guangxi Autonomus Region, Nanning City. V.28.1986. Paratypes: 1 male (BDN No. 20109), China, Fujian Province, Yongtai County, Qingyunshan. IX.19.2002. Leg. X–P Wang, light trap; 1 male (BDN No. 20687), Fujian Province, Jianning County. IX.26.2002. Zh. Liu, sweep net.

Entymology. Named for its close resemblance to C. atridorsum (Kieffer) .

Diagnosis. Superior volsella with only 1 basimedial seta. Digitus with pointed apex. Anal point with lateral setae.

Male imago (n =3)

Total length 1.61–2.00 mm, 1.83 mm. Wing length 0.88–1.10 mm, 1.01 mm. Total length/ wing length 1.71–1.89, 1.81. Wing length/profemur length 2.29–2.41, 2.34. Ground coloration yellowish green. Abdomen pale; eyes black; antenna brown. Eyes without dorsomedial extensions.

Head. Ultimate flagellomere 212–328 µm, 284 µm long. AR 0.58–0.84, 0.73. Temporals: 4–6 inner, 2 outer verticals and 0–1 postorbitals. Tentorium 100µm long, width 20–28 µm. Palpomere lengths (in µm): 30–50; 32–36; 80, 86–90, 140–152.

Wing ( Fig 10 ). VR 1.27–1.31, 1.29 and Cu length 420–536 µm, 492µm. Macrotrichia on membrane: R4+ 5 30–34, 32; M1+ 2 14–16, 15. Setae on veins: R 3–8, 6; R4+5 2; M1+ 2 15– 18, 17.

Thorax. Acrostichals 0–4; dorsocentrals 3–6, 4; prealars 1–3, 2. Scutellum with 1 seta (n =1).

Legs. Spur of front tibia 14–20 µm, 16 µm. Spurs of middle tibia 18–20 µm, 19 µm and 12–22 µm, 18 µm long, and of hind tibia 24–30 µm, 28 µm and 18–24 µm, 20 µm long. Combs of middle leg composed of 6–8, 7 and 7–9, 8 free teeth, of hind leg composed of 8–16, 12 and 10–12, 11 free teeth.

Lengths and proportion of legs (in µm):

Hypopygium ( Fig 11 ). Tergite IX with 5–8, 6 setae at base of anal point. Anal point broad and with constricted apex, 28–36 µm, 33 µm long, with about 5–10, 7 spinules and with 3–4 lateral setae. Phallapodeme 74–80 µm, 78 µm long, somewhat S shaped. Transverse sternapodeme 60–64 µm, 63 µm long. Gonocoxite 80–106 µm, 90 µm long. Superior volsella 23–36 µm, 30 µm long, with 4 5 dorsal setae and 1 basimedial apical seta. Digitus 20 µm long, tapering to pointed apex. Inferior volsella 40 µm long. Stem of median volsella 20–24 µm, 23 µm long, lamellae not extending beyond inferior volsella. Gonostylus 46–64 µm, 55 µm long. HR 1.56–1.74, 1.65; HV 2.94–3.70, 3.38.

Distribution. This species is known from Guangxi and Fujian Provinces (Oriental China).

Remarks. The hypopygium o f this species is similar to that of C. atridorsum (Kieffer) . However, in this species the superior volsella has only 1 basimedial seta, whereas that of C. atridorsum has 3. Also, the LR of the foreleg in this species (2.71–2.80, 2.75) is larger than that of C. atridorsum (1.97, as in Albu 1980).

Figures

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