The genus Rhyacophila Stephens (Trichoptera, Rhyacophilidae) in Yakushima Island, northern Ryukyu, southwestern Japan Author Ito, Tomiko text Zootaxa 2021 2021-08-17 5023 1 44 58 journal article 10.11646/zootaxa.5023.1.2 1175-5326 5225402 F6CB0172-C3B9-4E9F-ACBF-2BC006F588F5 Rhyacophila brevicephala Iwata 1927 , new to Yakushima Rhyacophila brevicephala Iwata 1927 , 217, pls. 5–6, larva, Japan (Honshu); Schmid 1970 , 55, 123, pl. 22, male; Hattori 2005 , 420, 429, 436, male, female, larva, habitat. Specimens examined . Yakushima Island : 3 males , Miyanoura-gawa, Yukawa-bashi, 9.v.2006 , TI , L (SPMN- IS); 1 male , Miyanoura-gawa, a tributary, 15.x.2007 , TI , S (SPMN-IS); 2 males , Shiratani-gawa, Shiratani-bashi, 14.vi.2007 , TI , L (SPMN-IS). Remarks . This species belongs to the R. brevicephala Species Group. Adults of this species were collected beside streams with stony bottoms at 20 to 80 m a.s.l., but never from high elevation sites ( Fig. 6E ). Distribution . Japan (Yakushima, Hokkaido , Honshu, Shikoku, Okino-shima, Goto-retto), Kuriles. New to Yakushima. Japanese name . Hiroatama-nagare-tobikera.