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A Late Cretaceous mammalian dentary from the Ashizawa Formation (Futaba Group), Fukushima, northeastern Japan

Abstract : A mammalian dentary discovered in the Coniacian Ashizawa Formation (Fukushima, northeastern Japan) is described. The specimen is a fragment of the horizontal ramus of a left edentulous dentary with five alveoli, the distal four of which are plugged with broken roots. Based on the morphologies of the dentary and the roots, it is considered to be of a therian mammal. This constitutes the first discovery of a Mesozoic mammal in northeastern Japan and highlights the potential for future mammal discoveries in the Cretaceous System in northeastern Japan, which will be significant for disclosure of the mammalian faunal evolution in East Asia during the Late Cretaceous.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02331977
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Submitted on : Thursday, October 24, 2019 - 3:44:01 PM
Last modification on : Tuesday, February 18, 2020 - 3:54:03 PM

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Nao Kusuhashi, Tadashi Suzuki, Kazuaki Terui, Atsushi Sato, Romain Amiot. A Late Cretaceous mammalian dentary from the Ashizawa Formation (Futaba Group), Fukushima, northeastern Japan. Island Arc, 2016, 25 (6), pp.403-409. ⟨10.1111/iar.12133⟩. ⟨hal-02331977⟩

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