The epiphyseal fusion stage of the <i>Paleoparadoxia tabatai</i> from Chichibu area in Saitama Prefecture, Japan

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  • 秩父地域産出<i>Paleoparadoxia tabatai</i>の骨端閉鎖状態の比較
  • 秩父地域産出Paleoparadoxia tabataiの骨端閉鎖状態の比較
  • チチブ チイキ サンシュツ Paleoparadoxia tabatai ノ ホネ タン ヘイサ ジョウタイ ノ ヒカク

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The bone size and the stages of epiphyseal fusion of the three specimens of Paleoparadoxia tabatai from the Chichibu area, Ohnohara, Hannya and Sanyama specimens were compared. From this comparison, these three specimens were classified into two groups, large and small form. In addition to this comparison, another two skeletal specimens of P. tabatai, the Izumi and Tsuyama specimens were discussed. The Izumi specimen is from Toki city, Gifu Prefecture, and the Tsuyama specimen is from Tsuyama City, Okayama Prefecture. As a result of comparison, the Tsuyama specimen was classified into the small form with the Sanyama specimen. And the Izumi specimen was classified into the large form with the Onohara and Hannya specimens. As a result of the comparison of the epiphyseal fusion stage, the small form specimens had also small body size in the mature one and the size is smaller than the large form. So, it is clear that the difference in size is not a growth change. Thus, the two groups in size seem to display sexually dimorphic characteristics. The large forms of the Ohnohara, Hannya and Izumi specimens were male, and the Sanyama and Tsuyama specimens were females. The bone size of three specimens of the large form group was very close, but the cranium of the Ohnohara specimen had no 3rd molars. Therefore, the growth of P. tabatai will stop before the 3rd molars are erupted.

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