コダマカワザンショウ属の八重山諸島産新種 (腹足綱: クビキレガイ上科: カワザンショウ科) — 同属で世界最北の現生種

Ovassiminea hayasei n. sp. is described from mangrove swamps in Iriomote and Ishigaki Islands, of the Yaeyama Islands at the southwestern part of the Ryūkyū Archipelago, Okinawa, Japan. This is the northernmost record among recent species of the genus Ovassiminea Thiele, 1927, which is distributed in the tropical and subtropical regions of the Western Pacific. The new species is known to be restricted to extremely narrow ranges and is evaluated as vulnerable in red lists by the governments of Japan and Okinawa Prefecture. A list of all available (five recent and five fossil) species names of Ovassiminea hitherto described, with synonymies, is also given as an Appendix.