Polypedilum (Tripodura) napahaiense

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 : 24-25

Polypedilum (Tripodura) napahaiense Zhang & Wang sp. n. (Figure 10) Type material. Holotype: male (BDN. 11304), CHINA, Yunnan Province, Zhongdian County, Napahai, 27. V. 1996. sweep net, X. Wang. Paratype: 1 male, as the holotype.

Etymology. Named after the type locality.

Diagnostic characters. The species differs from other members of the subgenus by the lanceolate anal point composed of two transparent lobes and wing markings.

Male imago (n=2)

Total length 3.08–3.29 mm. Wing length 2.43–2.46 mm. Total length/ wing length 1.27–1.36. Wing length / length of profemur 2.82–2.97.

Coloration. Head brown. Thorax brown, with darker postnotum, median anepisternum II and preepisternum, halteres yellow. All femora brown with a sub-apical pale ring; all tibiae and tarsi lost. Abdominal segments yellowish brown.

Head. AR 0.61. Ultimate flagellomere 410 µm long. Temporal setae 12–13, including 3–3 inner verticals, 5–6 outer verticals and 4–4 postorbitals. Clypeus with 19–20 setae. Tentorium 130–138 µm long, 29–36 µm wide. Palpomere lengths (in µm): 31–39, 34–39, 101–122, 107–112, 182–191.

Wing ( Figure 9A ). Wing with 4 plain markings, 2 in cell r4+5, 1 in cell m3+4 basal and extending to cell cu1 distal, 1 in the middle of cell an, cell m1+2 and distal area of cell r4+5 with cloudy spots. VR 1.29–1.42. R with 22–27 setae, R1 with 17–19, R4+5 with 25–30. Squama with 10 setae.

Thorax. Dorsocentrals 17, acrostichals 10–12, prealars 6–7. Scutellum with 15–20 setae.

Legs. Terminal scale ( Figure 10B ) of front tibia 34– 49 µm long, triangular and apically pointed. Spur of middle tibia 49 um long including 26 µm long comb, un-spurred comb 26 µm long, spur of hind tibia 57 µm long including 31 µm long comb, un-spurred comb 31 µm long. Width at apex of front tibia 57 µm, of middle tibia 65 µm, of hind tibia 78 µm. Tarsi of all legs missing.

Hypopygium ( Figure 10C, D ). Tergite IX with 7–10 median setae. Laterosternite with 1 seta. Anal point 94– 104 µm long, lateral projection 10–16 µm long. Anal point lanceolate, composed of triangular basal and oblong apical lobes. Phallapodeme 83–104 µm long; transverse sternapodeme 57–62 µm long. Gonocoxite 148–169 µm long. Superior volsella ( Figure 10C ) pad–like, expanded distally, with 5 short inner setae and 2 long apical setae. Inferior volsella slender, 109–120 µm long, with 11–12 oral setae and an apical seta. Gonostylus 187–211 µm long, with 6–7 long setae along inner margin. HR 0.79–0.80. HV 1.56–1.76.

Distribution. The species is known only from the type locality (Oriental China).

Remarks. The species is very close to P. (T.) yaumounei Moubayed, 1992 from Lebanon but differs from the latter by the following combination of characters: wing with one plain linear marking in cell m1+ 2 in P. (T.) yaumounei, without in the new species; the new species with transparent lobes on the anal point, without in P. (T.) yaumounei; P. (T.) yaumounei with 17–19 acrostichals, 32–33 scutellars and 16–19 median setae on tergite IX, the corresponding numbers are 10, 15–20, 7– 10 in the new species.

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.

FIGURE 10 A – D. Polypedilum (Tripodura) napahaiense Zhang & Wang sp. n. A. Wing. B. Fore tibial scale. C. Superior volsella. D. Hypopygium, dorsal and ventral view.