Amphipods - Amphipods

Japanese: 端脚類 - たんきゃくるい（英語表記）amphipod

A general term for crustaceans belonging to the order Amphipoda of the class Malacostraca. They are also called amphipods (→ amphipods). Generally, they are 0.5-2cm long, but some species are known to be over 20cm long. Their bodies are laterally compressed and consist of a head, seven thoracic segments, and six abdominal segments. Their habits are diverse and there is considerable variation in morphology, but they generally have two pairs of antennae, one pair of compound eyes, seven pairs of thoracic legs, and three pairs of abdominal limbs. The first and second thoracic legs are called maxillopods and have a scissor-like structure. There are approximately 5,600 known species in the world, divided into nearly 100 families. Most are marine, but there are also about 100 species that live on land, and they live in wetlands, rivers, lakes, and groundwater. (→ Arthropods, Malacostraca)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

軟甲綱端脚目 Amphipodaに属する甲殻類の総称。ヨコエビ類（→ヨコエビ）と呼ばれる。一般に体長 0.5～2cmであるが，20cmをこえる種も知られている。体は左右に側扁し，頭部，7胸節，6腹節からなる。多様な習性とともに形態の変異が著しいが，基本的には 2対の触角，1対の複眼，7対の胸脚，3対の腹肢をもつ。第1胸脚，第2胸脚は顎脚と呼ばれ，鋏状の構造となる。世界で約 5600種が知られ，100近い科に分けられている。ほとんどが海産であるが，陸上に産するものも約 100種あり，湿地，河川，湖沼，地下水などに生息する。（→節足動物，軟甲類）

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