†Distorsio (Rhysema) kotakai Ogasawara & Morita 1990

Ogasawara & Morita 1990. A new Miocene gastropod species co-occurred with Paleoparadoxia specimens from the Yanagawa Formation, Fukushima Prefecture, northeast Honshu, Japan. Saito Ho-On Kai Museum Research Bulletin, No. 58 1990: 25-31