881. AN EARLY MIDDLE PLEISTOCENE MURID RODENT MOLAR FROM THE KOBIWAKO GROUP, JAPAN

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  • 881. 古琵琶湖層群から産出した中期更新世前期の齧歯目ネズミ科の臼歯化石
  • 古琵琶湖層群から産出した中期更新世前期の齧歯目ネズミ科の臼歯化石〔英文〕
  • コ ビワコソウグン カラ サンシュツシタ チュウキ コウシンセイ ゼンキ ノ

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A murid M1 obtained from the Hiraen Clay Member of the Kobiwako Group is the oldest record of the family in the Japanese Islands. The molar is assigned to the small Japanese field mouse, Apodemus argenteus, an endemic species living in the islands today. It indicates that this species originated by the early Middle Pleistocene (0.65-0.7 Ma). Moreover, the molar contributes to reconstructing the Quaternary mammalian faunal succession in Japan, because the faunal content of mammalian biozone QM3 (0.5 to 0.73 Ma) is poorly known.

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