Branchiuran - Saibirui (English spelling)

Japanese: 鰓尾類 - さいびるい（英語表記）branchiuran

A general term for parasitic crustaceans classified as Branchiura in the subclass of the class Gnathopoda. They are related to butterflies. There is one order and one family, with about 100 known species. They are generally 1-1.5cm long. Their bodies are flattened and covered with a carapace. The second maxilla is modified into a pair of large suckers, between which lies the stinger and proboscis. A few species are known to have hooks instead of suckers. Most species are found in freshwater, where they temporarily parasitize the surface of fish and suck their blood. They can cause great harm in fish farms, and this parasitism is called fish lice infestation. (→ Gnathopoda, Arthropods)

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

Japanese:

顎脚綱鰓尾亜綱 Branchiuraとしてまとめられる寄生性甲殻類の総称。チョウの仲間。1目 1科で，約 100種が知られている。一般に体長 1～1.5cm。体は扁平で甲に覆われる。第2小顎が一対の大型の吸盤に変形し，その間に刺針と吻がある。吸盤の代わりにかぎ（鉤）を備えた種も若干知られている。大部分の種は淡水産で，魚類の体表に一時的に寄生して吸血する。養魚場で大きな害を受けることがあり，この寄生症をウオジラミ症と呼ぶ。（→顎脚類，節足動物）

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