...the extinct class of primitive stalked echinoderms, Cystoidea (illustration), that flourished from the Middle Ordovician to the Late Devonian. They generally consist of spherical bracts, which are covered with many irregular limestone plates. *Some of the terminology that mentions "Cystoidea" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…オルドビス紀中期~デボン紀後期に栄えた原始的な有柄棘皮(きよくひ)動物の絶滅綱Cystoidea(イラスト)。一般に球状の苞(ほう)からなり,苞は多くの不規則な石灰板でおおわれている。… ※「Cystoidea」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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>>: Cystidia truncangulata (English spelling)
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