Three new species and one new genus Masaophaedusa of fossil terrestrial Mollusca are described from fissure deposits within the Ryukyu Limestone in Okinawa and Yoron islands of the central Ryukyu Islands. They are Masaophaedusa takae, which occurred in Nishiku Fissure in Yoron Island and Katsuren Fissure in Okinawa Island, Chalepotaxis kenjii from Nishiku Fissure, and Coniglobus sashikiensis from Chinen Fissure in Okinawa Island. Masaophaedusa takae has characteristic, strong and long plicae, and its specialized clausilium has no relations with other genera of the Family Clausiliidae in Japan and adjacent areas. Chalepotaxis kenjii possesses a light brown, narrow band on the body whorl, and is closely related to Chalepotaxis spadix distributed in southern Taiwan. Coniglobus sashikiensis has a large shell and may be the ancestor of C. mercatorius, a living species of Okinawa Island.
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