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Tamura, M. (1959). On Kumatrigonia, a new subgenus of Frenguelliella, and a Tosapecten from the Carnic Tanoura Formation in Kyushu, Japan. Memoirs of the Faculty of Education, Kumamoto University, Natural Science. 7: 212-218.
Tamura, M. (1959). On Kumatrigonia, a new subgenus of Frenguelliella, and a Tosapecten from the Carnic Tanoura Formation in Kyushu, Japan. Memoirs of the Faculty of Education, Kumamoto University, Natural Science. 7: 212-218.
