Polypedilum (Uresipedilum) breviplumosum, Zhang & Wang, 2004

Zhang, Ruilei & Wang, Xinhua, 2004, Polypedilum (Uresipedilum) Oyewo and Saether from China (Diptera: Chironomidae), Zootaxa 565 (1), pp. 1-38 : 5-7

Polypedilum (Uresipedilum) breviplumosum sp. n.

( Fig. 2 )

Type material: Holotype male ( BDN No.12883): CHINA: Sichuan Province, Baoxing County, 19. VI. 1996, X. Wang . Paratype: 3 males; 2 males as holotype; 1 male, Sichuan Province, Kangding County, Wasigou , 15 VI 1996, X. Wang .

Etymology: From Latin brevis , short, and plumosus , refers to the short and reduced antennal plume.

Diagnostic characters: The species has a very low antennal ratio (AR= 0.22–0.23), which is unique within the subgenus; the reduced antennal plume as well as a head with weak frontal tubercles, will separate the species from other members of the subgenus.

Male imago (n = 4)

Total length 2.24–2.57, 2.40 mm. Wing length 1.43–1.59, 1.51 mm. Wing length/ wing width 2.53–2.65, 2.60. Total length/ wing length1.571.61, 1.59. Wing length /length of profemur 2.62–2.71, 2.67.

Coloration. Head, thorax and abdominal segments dark brown. Legs yellow except pale brown fore tarsi.

Head. With weak conical frontal tubercles. AR 0.22–0.23, 0.23. Ultimate flagellomere 126–147, 132 m long. Plume ( Fig. 2A ) reduced, sparse and weak. Temporal setae 11; including 2 inner verticals; 5 outer verticals and 4 postorbitals. Clypeus with 10–13, 11 setae. Tentorium 86–100, 93 m long, 13 m wide. Palpomere lengths (in m): 28–31, 29; 26–33, 30; 60–70, 64; 75–83, 79; 127–143, 133.

Wing ( Fig. 2B ). VR 1.30–1.41, 1.36. Brachiolum with 1 setae, R with 13–18, 15; R 1 with 9–11, 10; R 4+5 with 17–21, 19. Squama with 9–12, 11 setae.

Thorax. Dorsocentrals 11–16, 13; acrostichals 2–6, 4; prealars 3–4, 4. Scutellum with 5–9, 7 setae.

Legs. Terminal scale ( Fig. 2C ) of front tibia pointed, 36–40, 38 m long including 13– 18, 14 m long apical spine; spur on median tibiae 36–48, 42 µm long including 16–25, 21 m long comb, un­spurred comb 16–25, 20 m long, spur on posterior tibia 42–47, 44 m long including 21–26, 23 m long comb, un­spurred comb 18–23, 21 m long. Width at apex of front tibia 36–43, 39 m, of middle tibia 39–50, 45 m, of hind tibia 43–49, 45 m. Lengths (in m) and proportions of legs ( Table 2):

Hypopygium ( Figs. 2D–F ). Anal tergite bands fused basal to median anal tergite setae. Anal tergite with 2–3, 2 median setae, laterosternite with 2–3, 2 setae. Anal point 26–35, 33 m long, tapered to parallel­sided and ventrally bent at apex. Phallapodeme 60–73, 67 m long; transverse sternapodeme 26–32, 29 m long. Gonocoxite 118–125, 122 m long. Superior volsella 36–42, 39 m long base with 2 inner and 1 apical setae, microtrichiae present and base rounded at apex. Inferior volsella 65–80, 71 m, parallel­sided with 18– 23 basal setae and 1 apical seta. Gonostylus 86–100, 91 m long. HR 1.25–1.40, 1.34. HV 2.57–2.73, 2.63.

Distribution: The species was collected by light trap in Sichuan Province in (Oriental China).

Figures

FIGURE 2. Polypedilum (Uresipedilum) breviplumosum sp. n. A. Antenna. B. Wing. C. Fore tibia scale. D. Superior volsella. E. Dorsal view of hypopygium. F. Ventral view of hypopygium.