…The most primitive vertebrate fishes (Agnatha) were almost extinct by the end of the Devonian, and the only remaining species are the Cyclostomium. The Hagfishes and Lampreys belong to this class. *Some of the terminology that mentions "Agnatha" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…脊椎動物のうち,もっとも原始的な形質をもつ無顎口上綱Agnathaに属する魚類(無顎類)はデボン紀末までにほとんど絶滅し,残った現存種を含む唯一の綱が円口類Cyclostomiである。メクラウナギ目,ヤツメウナギ目がこの綱に属する。… ※「Agnatha」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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