Amphiprion (yokoebi) - Amphiprion (English spelling) beach‐flea

Japanese: ヨコエビ(横蝦) - ヨコエビ（英語表記）beach‐flea

A general term for crustaceans of the Amphipoda suborder, particularly those in the genus Gammaridea, family Gammaridea. They are often called springtails. The name gammaridea comes from the fact that these animals swim sideways through the water. The bodies of the Gammaridea amphipods are flattened from side to side and are divided into a head, seven thoracic segments, six abdominal segments, and a telson segment, with a pair of compound eyes on the head on each side. In general, the front four pairs of thoracic legs bend forward, and the rear three pairs face backward like the abdominal legs. Gills are developed on the inner surface of the basal plate of the second to seventh thoracic legs or the third to seventh thoracic legs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

端脚目ヨコエビ亜目の甲殻類の総称，とくにこのうちのヨコエビ科ヨコエビ属に属するものを指すことが多い。トビムシと呼ぶ場合も多い。ヨコエビの名はこれらの動物が体を横にして水中を泳ぐことによる。ヨコエビ類Gammarideaの体は左右に扁平で，頭部，胸部7節，腹部6節と尾節とに分かれており，頭部には左右1対の複眼がある。一般に前部の4対の胸脚は前方に曲がり，後部3対は腹肢と同様後方に向いている。えらは第2～7胸脚または第3～7胸脚の底節板内面に発達する。

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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