A mammal of the family Delphinidae in the suborder Odontoceti. A small oceanic dolphin with a long snout that is found in the tropical and subtropical regions of the Indian, Atlantic, and Pacific Oceans. It often leaps onto the surface of the water and spins its body (hence the English name spinner). From the waters off Hawaii to the Ogasawara Islands and southern Kyushu, a type of dolphin with a body length of about 2m is found, with a black-brown back, a white belly, and a wide gray-white band on the middle side of the body. This dorsal fin is of a normal dolphin type, but in the eastern Pacific, a type with a dorsal fin that slopes forward is found. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ハクジラ亜目マイルカ科の哺乳類。インド洋,大西洋,太平洋の熱帯~亜熱帯に分布する吻(ふん)の長い外洋性の小型イルカ。しばしば水面に跳躍し,体をきりもみさせる(英名spinnerの由来)。ハワイ近海から小笠原,九州南方にかけては,体長2m前後で,背面が黒褐色,腹面が白色で,中間の体側部が幅広い灰白帯となる型が分布する。この背びれはふつうのイルカ型であるが,東太平洋には,背びれが前方に傾斜する型が生息する。
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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