Mangrove crab; mud crab

Japanese: ノコギリガザミ（英語表記）mangrove crab; mud crab

A general term for four crab species belonging to the genus Scylla , family Portunidae, order Decapoda, class Malacostraca. There are four teeth on the frame and nine on the front edge of the carapace, all of which are triangular. The left and right chelae are different sizes, with one being larger than the other. Three species are found in Japan: S. serrata , S. olivacea , and S. paramamosain . This large species has a carapace width of up to 20 cm and a slightly elongated oval shape. S. spiny mob crabs are found throughout the Indo-West Pacific Ocean south of Sagami Bay, and are often found at the mouths of inland bays. They are well known as doman in Lake Hamana, Shizuoka Prefecture. They are abundant in mangrove swamps in tropical and subtropical regions south of the Ryukyu Islands, and are the most important crab for food. (→ Crustaceans, Decapods, Arthropods, Molluscans)

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

Japanese:

軟甲綱十脚目ワタリガニ科ノコギリガザミ属 Scylla に属するカニ 4種の総称。額縁に 4歯，甲の前側縁に 9歯あるが，いずれも三角形状。鋏脚は左右で大きさが異なり，片方が巨大。日本産はアミメノコギリガザミ S. serrata，アカテノコギリガザミ S. olivacea，トゲノコギリガザミ S. paramamosain の 3種である。甲幅 20cmに達する大型種で，甲はやや横長の楕円形。トゲノコギリガザミは相模湾以南のインド西太平洋全域に分布し，内湾の河口に多い。静岡県の浜名湖ではドウマンの名でよく知られている。琉球列島以南の熱帯・亜熱帯地方のマングローブ湿地には個体数が豊富で，食用として最重要のカニである。（→甲殻類，十脚類，節足動物，軟甲類）

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