Paleoparadoxia

Japanese: パレオパラドキシア（英語表記）Paleoparadoxia

A genus of mammals that existed in the middle Miocene and became extinct. It was about the size of a cow, lived an amphibious life, and is thought to have lived mainly in the coastal areas of the North Pacific Ocean. Currently, only one species, P. tabatai , is known. Fossils have been found in various places on the west coast of Japan and North America, but complete skeletons have been excavated in Toki City, Gifu Prefecture, Chichibu City, Saitama Prefecture, and on the campus of Stanford University in California, and a large skeleton has also been discovered in Tsuyama City, Okayama Prefecture. It is characterized by a low-profile skull, sturdy limb bones that extend out to the sides of the body, a plate-like sternum that has developed on the chest, and uniquely shaped molars.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

中新世中期にいて絶滅した哺乳類の1属。ウシぐらいの大きさで水陸両生の生活をして，主として北太平洋の海岸地帯にいたものと思われ，現在のところ1種P.tabataiが知られる。日本および北アメリカ西海岸の各地で化石が発見されているが，岐阜県土岐市，埼玉県秩父市，カリフォルニアのスタンフォード大学構内では全骨格が発掘され，岡山県津山市でもまとまった骨格が発見されている。頭骨は低平，がんじょうな四肢骨はからだの側方へのび，胸に板状の胸骨が発達するのが特徴で，臼歯も特異な形をしている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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