Development and growth of the feather star Oxycomanthus japonicus to sexual maturity

Tomoko F. Shibata, Atsuko Sato, Tatsuo Oji, Koji Akasaka

研究成果: Article査読

23 被引用数 (Scopus)


Crinoids, including feather stars, are the most basal group among extant echinoderm classes and share a basic body plan. In spite of their importance for evolutionary developmental study, information on the development of crinoids has been limited, because there are not many species whose spawning season is known, and artificial spawning is impossible. Therefore, it is not easy to obtain fertilized eggs of crinoids. We have observed the spawning and development of the feather star Oxycomanthus japonicus for 7 years. We have established a cultivation system that has enabled us to culture large numbers of O. japonicus from eggs through to sexually mature adults. In the present study, we show that (1) individuals take 2 years to reach sexual maturity; (2) the skeleton of the theca of a stalked juvenile consists of five orals, five basais, five radiais, five infrabasals, and an anal plate; and (3) the onset of spawning has shifted by about two weeks since 60 years ago. Our cultivation system can provide enough embryos, larvae, juveniles, and adults for further experiments, extending the possibilities for crinoid research.

ジャーナルZoological Science
出版ステータスPublished - 2008 11月

ASJC Scopus subject areas

  • 動物科学および動物学


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