Polypedilum (Tripodura) mengmanense Zhang & Wang

Zhang, Ruilei, Song, Chao, Qi, Xin & Wang, Xinhua, 2016, Taxonomic review on the subgenus Tripodura Townes (Diptera: Chironomidae: Polypedilum) from China with eleven new species and a supplementary world checklist, Zootaxa 4136 (1), pp. 1-53 : 22-24

Polypedilum (Tripodura) mengmanense Zhang & Wang sp. n.

( Figure 9 )

Polypedilum sp 5. SC. 114, 115; Song et al. 2016: 542.

Type material. Holotype: male (BDN. P004), Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Mengman County, Mengman Town, 4. V. 2013, light trap, S. Li. Paratype: 1 male, Sichuan Province, Xichang City, 4.VI. 1996, light trap, X. Wang.

Etymology. Name after the type locality.

Diagnostic characters. The species can be separated from other members of the subgenus by the wing marking, the superior volsella turned inwards apically and with 2 long sub-apical setae and 1 apical seta directed medially, distal margin of tergite IX triangular.

Male imago (n=2). Total length 2.12–2.59 mm. Wing length 1.28–1.33 mm. Total length / wing length 1.71– 1.95. Wing length / length of profemur 2.28–2.32.

Coloration. Dark brown species. Legs with femora distal 1/3, fore tibia, fore tarsomere I and fore tarsomere II basal 1/2 yellow; the remaining segments brown. Thorax brown with darker postnotum and preepisternum. All abdominal segments brown.

Head. AR 0.70–0.75. Ultimate flagellomere 310–340 µm long. Temporal setae 9–9, including 2–3 inner verticals, 3–4 outer verticals and 3–3 postorbitals. Clypeus with 12–13 setae. Tentorium 88–90 µm long, 15–20 µm wide. Palpomere lengths (in µm): 30–33, 30–33, 70–75, 78–80, 113–148; the 3rd segment bearing 2–3 sensilla chaetica.

Wing ( Figure 9A ). VR 1.30–1.32. R with 14–16 setae; R1 with 11–12; R4+5 with 16–18. Squama with 4–5 setae. Thorax. Dorsocentrals 12–15, including 1–3 humerals; acrostichals 14–15; prealars 4–5. Scutellum with 7–10 setae. Legs. Terminal scale ( Figure 9B ) of front tibia 40–45 µm long, triangular and apically pointed; spur of middle tibia 45–48 um long including 20–23 µm long comb, un-spurred comb 18–23 µm long, spur on hind tibia 45–50 µm long including 23–25 µm long comb, un-spurred comb 20–25 µm long. Width at apex of front tibia 38–40 µm, of middle tibia 38–40 µm, of hind tibia 45–50 µm. Lengths (in µm) and proportions of legs as in table 1.

Hypopygium ( Figure 9C, D ). Tergite IX with 6–7 median setae. Laterosternite with 2 setae. Anal point 53–55 µm long, lateral projections 50–55 µm long. Anal tergite bands not fused basal to median setae. Phallapodeme 70– 75 µm long; transverse sternapodeme 43–55 µm long. Gonocoxite 93–115 µm long. Superior volsella ( Figure 9C ) 40–53 µm long, with apex turned inwards, the base and apex covered with microtrichiae, the apex bearing 2 strong setae and 1 long apical seta directed medially. Inferior volsella parallel-sided, 75–83 µm long, with 7 oral setae and 1 apical seta. Gonostylus 125–130 µm long, with 5–6 long setae along inner margin. HR 0.74–0.92. HV 1.74–2.07.

Distribution. The species was collected in Sichuan and Yunnan provinces (Oriental China).

Remarks. The new species resembles P. (T.) neoperturbans Ree, 2009 distributed in Korea. They are compared in Table 3 .

Figures

FIGURE 9 A – D. Polypedilum (Tripodura) mengmanense Zhang & Wang sp. n. A. Wing. B. Fore tibial scale. C. Superior volsella. D. Hypopygium, dorsal and ventral view.