tanakaYoshihiro Tanaka. Osaka Museum of Natural History, Nagai Park 1-23, Higashi-Sumiyoshi-ku, Osaka, 546-0034, Japan This email address is being protected from spambots. You need JavaScript enabled to view it. and Division of Academic Resources and Specimens, Hokkaido University Museum, Kita 10, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810 Japan and Numata Fossil Museum, 2-7-49, 1 Minami, Numata Town, Hokkaido, 078-2202 Japan

Yoshi Tanaka is a curator at Osaka Museum of Natural History, Japan and also a researcher at Hokkaido University Museum. He works on the morphology and phylogeny of marine mammals (dolphins, porpoises, whales and walruses) from Japan, Ecuador and New Zealand. This paper is a part of his research project of an ancient bay in Osaka.

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Hiroyuki Taruno. Osaka Museum of Natural History, Nagai Park 1-23, Higashi-Sumiyoshi-ku, Osaka, 546-0034, Japan This email address is being protected from spambots. You need JavaScript enabled to view it.

Hiroyuki Taruno is a former curator and currently a researcher of Osaka Museum of Natural History, Japan. He has researched on local geology, vertebrate paleontology and osteology for half a century. His long-term research activities have expanded his interests on taxonomy, paleogeography and evolution of elephants, deers, carnivoras and crocodiles from the Pliocene to Holocene.