A Balaenopterid skull (Order Cetacea) from the Early Pleistocene of Kuromatsunai, Hokkaido, Japan

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  • 北海道黒松内町の前期更新世から産出したナガスクジラ科の鯨類化石
  • ホッカイドウ クロマツナイマチ ノ ゼンキ コウシン セイ カラ サンシュツ シタ ナガスクジラカ ノ ゲイルイ カセキ

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Abstract

A partial mysticete skull (Order Cetacea) was discovered in the early Pleistocene (1.2-1.0Ma) Setana Formation at Kuromatsunai, Hokkaido, Japan. We have identified it as a member of the family Balaenopteridae gen. et sp. indet. based on features of the occipital region. The breadth of the occipital is within the adult range of the recent species Balaenoptera brydei, B. borealis, and B. physalus or B. musculus. This fossil indicates that very large species of the family Balaenopteridae had evolved and radiated before the early Pleistocene.

Journal

  • Fossils

    Fossils 87 (0), 23-27, 2010

    Palaeontological Society of Japan

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