…An animal phylum within the invertebrates. It is a group of lower bilaterally symmetrical animals excluding the phyla Platymorpha, Nematoda, and Cynomorpha, and includes seven classes: Rotifera, Nematoda, Gastrotrichum, Nematoda, Kinorhyncha, Priapulida, and Acanthocephala. However, because there are many unknowns about the relationships between these classes, and because there are significant differences in characteristics such as the cleavage pattern of the eggs, these classes are sometimes treated as independent phyla, and sometimes only Acanthocephala are treated as a single animal phylum, and the remaining six classes are lumped together as Capsularia. *Some of the terminology that mentions "horseshoe cricket" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…無脊椎動物の中の一動物門。扁形・紐形・曲形動物門を除いた下等な左右相称動物を一括し,輪虫綱,線虫綱,腹毛綱,線形虫綱,動吻(どうふん)綱,プリアプルス綱,鉤頭虫(こうとうちゆう)綱の7綱を含んでいる。しかし,これらの各綱の類縁関係に不明な点が多く,また卵割の様式などそれぞれに相当重要な特徴に違いがあることなどから,これらの各綱を独立した1門として扱ったり,また鉤頭虫類のみを一つの動物門にして残りの6綱を一括して袋形動物とする場合もある。… ※「ウマカイチョウ」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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