Informa UK Limited Acta Medica Okayama 1323-5818 45 1 2024 A new species of Ovassiminea Thiele, 1927 (Gastropoda: Truncatelloidea: Assimineidae) from the Yaeyama Islands, Okinawa, southern Japan ― the northernmost record among recent species of the genus 58 73 EN Hiroshi Fukuda Conservation of Aquatic Biodiversity, Faculty of Agriculture, Okayama University Hirofumi Kubo Okinawa Prefectural Institute of Health and Environment 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. No potential conflict of interest relevant to this article was reported.

岡山大学埋蔵文化財調査研究センター Acta Medica Okayama 2015 2017 岡山大学埋蔵文化財調査研究センター紀要2015 EN Kentaro Minami Archaeological Research Center, Okayama University Yuji Yamaguchi Archaeological Research Center, Okayama University Hiroshi Fukuda Graduate School of Environmental and Life Science, Okayama University Takahiro Nozaki Archaeological Research Center, Okayama University No potential conflict of interest relevant to this article was reported.

岡山大学理学部地球科学教室 Acta Medica Okayama 1340-7414 9 1 2002 西表島船浦湾におけるマングローブ干潟の堆積環境　―堆積物と生物遺骸の保存状況について― 9 18 EN Hiroyuki Azuma Masayuki Saigusa Hiroshi Fukuda The distribution of conch shell contained in clastic sediments in the mangrove swamps in the Funaura Bay, Iriomote Island, Okinawa Prefecture was studied. The sediments in the mangrove swamp are mainly composed of up to 90% sands. The sand clasts are inferred to be derived from the sandstone of Miocene Yaeyama Group. The conch shells are richer in the muddy fraction than the sandy fraction. Many Terebralia palustris inhabit the mangrove swamp. However few dead shells were also observed in the sediments. Effect of selective transportation hermit crabs is considered to be the cause of this distribution. No potential conflict of interest relevant to this article was reported.

岡山大学農学部 Acta Medica Okayama 0474-0254 92 1 2003 岡山大学農学部水系保全学研究室所蔵貝類標本（１） 75 102 EN Hiroshi Fukuda A Systematic list is given for molluscan specimens which are deposited in the Laboratory of Conservation of Aquatic Biodiversity, Faculty of Agriculture, Okayama University (OKCAB). These specimens are available on loan for scientific purposes. Any individual or organization wishing to request a specimen for loan should contanct the present author. No potential conflict of interest relevant to this article was reported.