北海道瀬棚層(前期更新世)産海生哺乳類化石

概要

論文の詳細を見る
Two marine mammal teeth from the Early Pleistocene Setana Formation, which have been catalogued at the National Science Museum as lower cheek teeth of Physeter? sp. (Cetacea : Physeteridae), are re-identified as a right lower canine of the extinct huge sea lion of the subfamily Otariinae in the family Otariidae and a right lower cheek tooth of the killer whale, Oricnus sp., of the subfamily Globicephalinae in the family Delphinidae. Because of these re-identifications, no published fossil record of the genus Physeter is presently known in Japan, and it became clearer that a huge species of sea lion was present in northwestern Pacific during the Early Pleistocene although its generic assignment is still not possible.
国立科学博物館の論文
1993-12-22