…Most brachiopods are sessile, epiphytic creatures that live by attaching themselves to rocks or other organisms using stalks, spines, and abdominal shells, but some lose their stalks and lie freely on the sea floor. Some members of the Productus genus , which flourished toward the end of the Paleozoic era, are thought to have attached their shells tightly to rocks like oysters, while members of the Chonetes genus, which lived in the seas of the same time, have thin, uneven shells that are thought to move by closing their shells instantly and ejecting a current of water like scallops. On the other hand, there are very rare endogenous creatures, such as the scallop, that live by digging holes in the shallows of sandy, muddy inland seas. … *Some of the terminology explanations that mention "Chonetes" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…大部分の腕足類は,肉茎,とげ,腹殻などによって岩石や他生物に付着して生活する固着・表生型であるが,肉茎が失われて自由に海底に横たわるものもある。古生代の終りころに栄えたプロダクタスProductusの仲間のあるものは,カキのように殻でぴったりと岩石に付着していたと考えられているし,同じころの海にすんでいたコネーテスChonetesの仲間は,薄い凹凸型の殻をもっており,ホタテガイのように,瞬間的に殻を閉じて水流を噴出させて移動したとされている。また一方では,シャミセンガイのように,砂泥質の内海の浅所に穴を掘ってすむ内生型のものも,ごくまれにある。… ※「Chonetes」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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