889. GROWTH AND LIFE MODE OF A PLEISTOCENE BRACHIOPOD, KIKAITHYRIS HANZAWAI (YABE)

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  • 889. 更新世腕足動動Kikaithyris hanzawai (Yabe)の成長と生活様式
  • 更新世腕足動物Kikaithyris hanzawai(Yabe)の成長と生活様式〔英文〕
  • コウシンセイ ワンソク ドウブツ Kikaithyris hanzawai Y

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Abstract

The onset of sexual maturity in the Pleistocene free-living brachiopods appears to be reflected in shell morphology. This interpretation is based upon the demonstration of a two phase relationship between shell length and shell convexity, and assumes that the phase change is triggered by, or at least closely correlated with the first development of gonadal tissues. The results suggest that Kikaithyris hanzawai became sexually mature prior to the adoption of a secondary free-living life habit. A similar relationship between morphology and sexual maturity has been demonstrated in the Recent brachiopod Laqueus rubellus, which belongs to the same family as Kikaithyris hanzawai.

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