Hydrozoa
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...A general term for free-swimming Hydrozoa and Scyphozoa species in the phylum Coelenterata (Cnidaria), and Ctenophora ctenophores (Ctenophora) (illustration). A type of plankton. From [Hydrozoa]…any of the cnidarians (coelenterates) of the class Hydrozoa, which are divided into five orders. Some species have only stationary polyp forms, only swimming jellyfish forms, or alternate between polyp and jellyfish forms during their life cycle. *Some of the terminology that mentions "Hydrozoa" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…腔腸動物(刺胞動物)門のヒドロ虫綱Hydrozoaとハチクラゲ綱Scyphozoaの自由遊泳型と有櫛（ゆうしつ）動物Ctenophoraの個体の総称（イラスト）。プランクトンの一員。… 【ヒドロ虫】より…ヒドロ虫綱Hydrozoaの腔腸動物(刺胞動物)の総称で，5目に分けられる。一生の間，定着性のポリプ型のみ，あるいは遊泳性のクラゲ型のみ，またはポリプ型からクラゲ型を経て世代の交替をするものがある。… ※「Hydrozoa」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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