小笠原諸島聟島周辺および琉球列島重宝曽根から採集されたオニムシロ類

概要

論文の詳細を見る
Five species of the genus Morum (Family Harpidae), namely, M. cancellatum, M. watsoni, M. joelgreenei, M. watanabei and an unidentified Morum species, were recorded from the lower sublittoral to upper bathyal waters of off Mukojima Island, Ogasawara (the latter four spp.) and Choho-sone Bank, Ryukyu Islands (M. cancellatum). The occurreuce of M. watanabei from Mukojima Is. is possibly new distribution record in the Japanese waters. The mature specimen of M. watsoni is described for the first time. The shell of M. watsoni is characterized by thickly swollen, smooth columellar callus with round margin, which resembles to that in M. teramachii, while M. watsoni is separable from M. teramachii by the shoulder spines and distinct spiral bands. Unidentified Morum sp. has characteristic features with narrow spiral interstices, distinct brown spine bands, and keeled columellar callus sculpture, and the combination of there three characters never match to that in previously known recent species.
日本貝類学会の論文
1999-12-31