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1 January 2022 A New Physeteroid from the Lower Miocene of Japan
Toshiyuki Kimura, Yoshikazu Hasegawa
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We describe a new specimen of physeteroid from the lower Miocene (Burdigalian) of Japan. This specimen was recovered from the Toyohama Formation, Chita County, Aichi Prefecture, Japan in 1984 and includes a finely preserved cranium with detached teeth and ear bones (periotic, tympanic bulla, and malleus). Here we refer this specimen to a new genus and species of the Physeteroidea, Miophyseter chitaensis gen. et sp. nov. Our phylogenetic analysis suggests that Miophyseter is a physeteroid more closely related to the crown Physeteroidea (Physeteridae and Kogiidae) than the macroraptorial physeteroids that flourished in middle and late Miocene times. A deep and large excavation on the ventral surface of the palatine and pterygoid in Miophyster suggests an adaptation for deep dives and/or the development of robust pterygoid muscles for active biting.

© by the Palaeontological Society of Japan
Toshiyuki Kimura and Yoshikazu Hasegawa "A New Physeteroid from the Lower Miocene of Japan," Paleontological Research 26(1), 87-101, (1 January 2022).
Received: 27 June 2020; Accepted: 3 November 2020; Published: 1 January 2022
Miophyseter chitaensis
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