Homalozoaの意味・使い方・読み方

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出典:『Wikipedia』 (2011/06/12 21:37 UTC 版)

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引用: The Homalozoa are extinct, Paleozoic echinoderms that lacked the typical pentamer body form. Instead all homalozoans were markedly asymmetric. Homalozoans are extremely variable in forms, but they all were sessile animals. The body (theca) was covered with calcite plates with a number of openings. Their form is in some cases so unusual that it is unclear which openings are to be considered as mouth and anus. Many of them were stalked, similar to sea lilies (crinoids), but often their bodies were bent over, so that the mouth and anus projected forwards rather than upwards. Some forms, especially stylophorans, rested flat on the sea floor. In some forms the single ray (brachiole or aulacophore) possessed an ambulacral groove. It has been claimed that some forms possessed gills and gill slits.

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Weblio英和・和英辞典に掲載されている「Wikipedia英語版」の記事は、WikipediaのHomalozoa (改訂履歴)の記事を複製、再配布したものにあたり、Creative Commons Attribution-ShareAlike (CC-BY-SA)もしくはGNU Free Documentation Licenseというライセンスの下で提供されています。