Polypedilum (Pentapedilum) tissamaharense, Oyewo & Saether, 2008

Oyewo, Emmanuel Adeoye & Saether, Ole A., 2008, Revision of Polypedilum (Pentapedilum) Kieffer and Ainuyusurika Sasa et Shirasaki (Diptera: Chironomidae), Zootaxa 1953, pp. 1-145 : 108

Polypedilum (Pentapedilum) tissamaharense sp. n.

( Fig. 36)

Type material. Holotype male, SRI LANKA: Tissamaharama , 16.vii.1973, B. Scharf ( ZSM) . Paratype: 1 male, same data as holotype ( ZSM). SRI LANKA: Wilpattu National Park , 26.i.1979, M. Müller ( ZSM) .

Diagnostic characters. Among species with strongly haired wing membrane, uniformly colored abdomen, no spur on foretibial scale, and base of superior volsella without microtrichia and with 2-3 inner setae, only P. (Pe.) tissamaharense and P. (Pe.) daitokeleum have the projection of the superior volsella curved with seta medially. P. (Pe.) daitokeleum , however, has two combs on both mid and hind tibia and the fourth tarsomere of the foreleg longer than the third.

Etymology. Named after the type locality, Tissamaharama.

Male (n = 2)

Total length 2.51 mm. Wing length 0.99–1.17 mm. Total length / wing length 2.15. Wing length / length of profemur 2.11. Thorax and abdominal segments pale brown to brown, femur, tibia, and tarsi pale brown.

Head. AR 1.26–1.32. Ultimate flagellomere 278–325 µm long. Temporal setae 5 including 2 inner verticals, 2 outer verticals, and 1 postorbital. Clypeus with 25 setae. Tentorium 78 µm long, 4 µm wide at posterior tentorial pit. Stipes 138 µm long. Palpomere lengths (in µm): 24, 33, 88–92, 88–93, 138–145. Fifth palpomere / third palpomere 1.49–1.65. Third palpomere with 1–2 sensilla clavata.

Thorax. Acrostichals 16–17, dorsocentrals 28, prealars 7. Scutellum with 6–8 setae.

Wing. Anal lobe reduced. VR 1.26–132. Brachiolum with 1 seta, R with 30–33, R 1 with 18–20, R 4+5 with 42–53, Sc 27–43, RM 3–4, M with 6–8, M 1+2 with 59–62, M 3+4 with 21–30, Cu with 28–33, Cu 1 with 9, PCu with 51, and An with 14–22 setae. Cells r 4+5 and m 1+2 with more than 100 macrotrichia, cell m 3+4 with 65–90, cell m basal of RM with 40–50, an plus cu with 110–115 macrotrichia. Squama with 3 setae.

Legs. Scale on foretibia ( Fig. 36A) 29–33 µm long, nearly rounded, without apical spur. Spurs on midtibia 45–49 µm long, on hind tibia ( Fig. 36B) 47–49 µm long. Comb on midtibia 14–19 µm long, combs on hind tibia 19 µm and 10–12 µm long. Width at apex of foretibia 35–40 µm, of midtibia 36–43 µm, of hind tibia 40– 45 µm. Length and proportions of legs as in Table 44.

Hypopygium ( Fig. 36D). Tergite IX with 8 median setae, laterosternite IX with 2 setae. Anal point 43–48 µm long, 8 µm wide at base, nearly parallel-sided towards 5 µm wide apex. Transverse sternapodeme 27–40 µm long, phallapodeme 51–60 µm long. Gonocoxite 115–119 µm long. Superior volsella ( Fig. 36E–F) 50 µm long, base bare with 2–3 inner setae, projection with 1 lateral seta. Inferior volsella ( Fig. 36C) 83–86 µm long, parallel-sided, with prominent, long apical seta. Gonostylus 80–87 µm long. HR 1.37; HV 2.88.

Distribution. Known only from Sri Lanka.