…the group of animals that make up the phylum Arthropoda, class Crustacea, that live primarily in water and breathe through gills. There are about 50,000 species, most of which are marine, and they make up the majority of the Arthropods, along with insects and spiders that live primarily on land and breathe air through tracheas. Most are free-swimming or walking, but many are sessile or parasitic. They are distributed throughout the hydrosphere, and their morphology and ecology are extremely diverse. *Some of the terminology that mentions "Crustacea" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…節足動物門甲殻綱Crustaceaを形成する動物群で,基本的には水中にすみ,えら呼吸をする。約5万種であるが,その大部分は海産種で,おもに陸上生活をし,気管により空気呼吸をする昆虫類およびクモ類とともに節足動物の主要部を構成する。多くは自由遊泳または歩行性であるが,固着や寄生生活をするものも少なくない。分布はあらゆる水圏にわたっており,形態,生態の多様化が著しい。 ※「Crustacea」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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