…the name of the animals belonging to the phylum Chordata, so named because the embryo always develops a notochord. They are an important taxon in the animal kingdom, living in almost every environment, and have undergone rapid adaptive radiation, resulting in a great deal of morphological variation, with body lengths ranging from 1 mm in the urochordates to over 30 m in the blue whale. From [Invertebrates]…A general term for animals that do not have a vertebrate in their body. Because protochordates have a notochord on the back of their body, they are sometimes grouped together with vertebrates in a single phylum called Chordata, but protochordates are generally included in the invertebrates. Currently, there are about 950,000 known species of invertebrates, of which 750,000 are arthropods, including insects. … *Some of the terminology that mentions "Chordata" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…脊索動物門Chordataに属する動物の総称で,胚にはつねに脊索ができるのでこの名がある。動物界の重要な1分類群で,ほとんどあらゆる環境に生息し,適応放散が著しく,形態がきわめて変化に富み,体長は尾索類の1mmからシロナガスクジラの30m以上に及ぶ。… 【無脊椎動物】より…体内に脊椎を終生もたない動物の総称。原索動物が一時的にも脊索を体の背部にもつことで脊椎動物といっしょにされて脊索(せきさく)動物Chordataという1門にされることもあるが,一般的に原索動物は無脊椎動物に含められている。 現在,無脊椎動物は約95万種が知られていて,そのうち75万種が昆虫を含む節足動物である。… ※「Chordata」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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