Abai, MR

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6th International Congress of Dipterologytubules, chaetulae of palpiger composed of 2 different types of chaetulaedissidens (Walker), (dystenus Kieffer?), thailandicus (Hshimoto)3. pagana-group: antepronotum distinctly divided at middle by aconspicuous V-shaped notch, scutal tubercle indistinct, acrosthichalsnormally developed; larva with one pair of ventral tubules, chaetulae ofpalpiger rather long compared with those of Chironomus. pagana(Maigen), chelonia Townes?Key Words: Chironomidae, Chironominae, Einfeldia, external morphology,taxonomy∗∗∗∗∗∗∗∗∗∗314
6th International Congress of DipterologySystematic study of the subgenus Tripodura Towns of thegenus Polypedilum Kieffer (Chironomidae) in IriomoteIsland, the Ryukyus, JapanYamamoto, N. (1), T. Hirowatari (1) & M. Yamamoto (2)(1) Entomological Laboratory, Graduate School of Life and Environmental Sciences,Osaka Prefecture University, Gakuen-cho 1-1, Sakai, Osaka, 599-8531 Japan(2) Kanyo Kagaku Co. Ltd., 1-7-3 Nakasakurazuka, Toyonaka, Osaka, 561-0881 JapanThe Chironomidae are one of the hugest families in Diptera, occurringin all zoogeographical regions including the Antarctica. In Japan, morethan 70 species of the genus Polypedilum Kieffer, 1912 in the subfamilyChironominae have been recorded (cf. Sasa & Kikuchi, 1995; Kondo et al,2001). The subgenus Tripodura Towns, 1945 belonging Polypedilum ischaracterized by the superior volsella that is broad, pad-like and coveredentirely by microtrichia, with 1 to several long posterior setae and withoutbare distal or inner process and/or tergite IX often with projections lateralto each side of anal point (Sæther et al., 2000). As a result of several-yearssurvey, we recognized five newly recorded species, including two newspecies, from Iriomote that is one of main islands of the Yaeyama islandslocated in the subtropical region in southernmost part of Japan, betweenTaiwan and Okinawa Island, and have been noted by the distribution ofsome endemic plants and animals.In the present study, we newly recorded P. (T.) sagitteferum(Tokunaga, 1938), P. (T.) unifascium (Tokunaga, 1940) and P. (T.)tananense Sasa et Hasegawa and recognized two new species, P. (T.) sp.1and P. (T.) sp.2, from Iriomote Island, the Ryukyus. Polypedilum (T.) sp. 1is similar to P. (T.) subovatum Freeman, 1957 in the general habitus ofmale genitalia, but from which it can be distinguished by the superiorvolsella with a distinct long seta and the anal point being graduallyexpanded toward apex. Polypedilum (T.) sp. 2 is allied to P. (T.) sp.1 inhaving the distinct long seta of superior volsella, but it is separable from itby the presence of the lateral tooth.315
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Abai, MR

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