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 nigrocephala Iwata 1927 Rhyacophila nigrocephala Iwata 1927 , 216, pl. 6, larva, Japan (Honshu); Kuhara & Ito 2017 , 14, 16, Japan (Yakushima); Hattori 2005 , 424, 433, male, female, habitat. Specimens examined . Yakushima Island : 6 males , 5 females , Miyanoura-gawa , Yukawa-bashi , 9.v.2006 , TI , L (SPMN-IS); 2 females , Miyanoura , Kue-gawa , Biwatsubo-bashi , 8.v.2006 , TI , L ( SPMN-IS ); 1 female , Yoshidagawa , Yoshida-bashi , 40 m , 25.ix.2003 , N. Kuhara ( N. Kuhara ) . Remarks . This species belongs to the R. nigrocephala Species Group. Adults of this species were collected beside streams with stony bottom at 20 to 70 m a.s.l., but never from higher elevation sites ( Fig. 6F ). Distribution . Japan (Yakushima, Honshu, Shikoku, Kyushu, Okino-shima). Japanese name . Munaguro-nagare-tobikera.