M.  Tamura, ?Upper Jurassic Pteriacea from the Soma Group, Fukushima Prefecture, Japan?, Transactions and Proceedings of the Palaeontological Society of Japan, New Series, vol. 37, pp. 223-229, 1960.

M.  Tamura, ?Upper Jurassic Pteriacea from the Soma Group, Fukushima Prefecture, Japan?, Transactions and Proceedings of the Palaeontological Society of Japan, New Series, vol. 37, pp. 223-229, 1960.