…Arthropods can be found in every environment on Earth, adapted to each environment. They are phylogenetically related to annelids such as earthworms and lugworms, but whereas annelids have a homoregular (similar) body segmentation (homonomous metameres), arthropods have heteroregular body segments (heteronomous metameres). In other words, the body segments arranged in front and behind each other have different forms and functions, which is thought to have ultimately led to the differentiation and prosperity of arthropods. … *Some terminology explanations that mention "heteronomous metamere" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…地球上のあらゆる環境に,それぞれに適応した節足動物を見ることができる。 系統的にはミミズ,ゴカイなどの環形動物に類縁関係をもつが,環形動物が同規的(同じような構造の)体節制(等体節homonomous metamere)をもつのに対し,節足動物の体節は異規的に配列している(不等体節heteronomous metamere)。すなわち,前後に並ぶ体節が形態や機能を異にしており,これが結局は節足動物の分化,繁栄をもたらしていると考えられる。… ※「heteronomous metamere」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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