Polypedilum (Uresipedilum) medium, Zhang & Wang, 2004

Zhang, Ruilei & Wang, Xinhua, 2004, Polypedilum (Uresipedilum) Oyewo and Saether from China (Diptera: Chironomidae), Zootaxa 565 (1), pp. 1-38 : 24-26

Polypedilum (Uresipedilum) medium sp. n.

( Fig. 10 )

Type material: Holotype male ( BDN No. 1660): CHINA: Guangxi Autonomous Region, Jinxiu County, Luoxiang Town , Daleng Village , 7. VI. 1990, X. Wang.

Etymology: From Latin medius, means middle, refers to the projection arising from middle part of superior volsella.

Diagnostic characters: The unique feature of the new species is the apicomedial projection of the superior volsella arising from the middle portion, unlike other species in the subgenus where it arises from the basal part. Moreover, the few oral setae on the inferior volsella, the slender and short anal point, and the superior volsella without inner setae will separate the new species from other members of the subgenus.

Male imago (n = 1)

Total length 2.73 mm. Wing length 1.51 mm. Total length/ wing length 1.80. Wing length /length of profemur 2.06.

Coloration. Entirely pale yellow to yellow.

Head. AR 1.76. Ultimate flagellomere 683 m long. Temporal setae 8; including 3 inner verticals; 3 outer verticals and 2 postorbitals. Clypeus with 13 setae. Tentorium 112 m long, 34 m wide. Palpomere lengths (in m): 29; 36; 99; 96; 161

Wing ( Fig. 10A ). VR 1.23. Brachiolum with 1 seta, R with 12; R 1 with 7; R 4+5 with 15. Squama with 7 setae.

Thorax. Dorsocentrals 12; acrostichals 12; prealars 3. Scutellum with 6 setae.

Legs. The hind leg lost. Terminal scale ( Fig. 10B ) of front tibia oval, 29 m long; spur on median tibiae 47 µm long including 21 m long comb, un­spurred comb 18 m long. Width at apex of front tibia 29 m, of middle tibia 42 m. Lengths (in m) and proportions of legs ( Table 10):

Hypopygium ( Figs. 10C–E ). Anal tergite bands not fused basal to median anal tergite setae. Anal tergite with 5 median setae, laterosternite with 2 setae. Anal point 42 m long tapering to parallel­sided. Phallapodeme 65 m long; transverse sternapodeme arched. Gonocoxite 117 m long. Superior volsella 26 m long, base with microtrichiae and an apical seta, without inner setae basal portion with a prominent basal process bearing 1 or 2 setae, apicomedial projection 16 m long arising medially from the apex of superior volsella. Inferior volsella 55 m long, not broadened subapically with 4 oral setae and 1 apical seta. Gonostylus 122 m long. HR 0.96. HV 2.24.

Distribution: The species was collected in a subtropical mountain area in Guangxi, Oriental China.

Figures

FIGURE 10. Polypedilum (Uresipedilum) medium sp. n. A.Wing. B. Fore tibia scale. C. Superior volsella. D. Dorsal view of hypopygium. E. Ventral view of hypopygium.