Large crustaceans - Ogata koukakurui

…A general term for the group of animals belonging to the order Decapoda of the class Crustacea of ​​the phylum Arthropoda, including shrimp, hermit crabs, and crabs. There are said to be about 10,000 species in the world, and they are considered higher crustaceans than lower crustaceans such as water fleas and amphipods. They are also called large crustaceans because there are generally many large species. Prawns, freshwater shrimp, and freshwater crabs can be found in the upper reaches of rivers, valleys, and lakes, and like other groups of animals, many species live in the intertidal zone and shallow seas, leading a diverse lifestyle. …

*Some of the terminology that refers to "large crustaceans" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…節足動物門甲殻綱十脚目Decapodaに属する動物群の総称で，エビ，ヤドカリ，カニ類を含む。世界に約1万種といわれ，下等なミジンコやヨコエビ類などに比較して高等甲殻類とされ，また，一般に大型種が多いことから大型甲殻類ともいわれる。河川の上流，谷川，湖沼にはテナガエビ類やヌマエビ類，サワガニ類が見られ，潮間帯から浅海にかけては他の動物群と同様に多数の種がすみつき，変化に富んだ生活を繰り広げている。…

※「大型甲殻類」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