<国立科博専報>伊豆諸島の陸産貝類相とその生物地理学的意義

概要

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Fourty-nine species of land snails have been recorded from the Izu Islands. They are consisted of the following three elements. (1) The greater part derived from Honshu to these islands via Izu Peninsula. (2) Three species of the northern element, i.c., Cionella lubrica, Disdus pauper and Zonitoides yessoensis, extended from the northern Japan and Siberia down to the southern Japan such as Kikaigashima, south of Kyushu in the last gracial age and survived in these islands until today. (3) Luchuena hachijoensis, Proreinia nakadae, Phaeohelix miyakejimana, Metazaptyx hachijoensis and Trishoplita hachijoensis belong to Yakushima-Tanagashima element which was carried to these islands from Yakushima and Tanegashima, south of Kyushu, by the ocean current. Four species among them were differentiated into the specific rank. Based on the distribution of these land snails, the Izu Islands are divided into three biogeographical regions, namely, Hachijo-Aogashima, Miyake-Mikura and Oshima-Kozushima.
国立科学博物館の論文
1977-12-20