Risso's dolphin (flower giant head)

Japanese: ハナゴンドウ(花巨頭) - ハナゴンドウ（英語表記）Risso’s dolphin

A mammal of the Odontocetiidae suborder, Delphinidae family. A pilot whale-type dolphin found in temperate and tropical open oceans around the world. The forehead stands almost vertically, with a vertical depression in front. It has no beak, and has several pairs of teeth only on the lower jaw. The dorsal fin is high and located almost in the center of the body. The pectoral fins are also relatively long. Juveniles are almost entirely black-brown, but gradually become lighter in color, becoming light gray or white in adults. The surface of their bodies is covered with countless scratches made by the teeth of their dolphins, which resemble pine needles, hence the nickname pine dolphin.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ハクジラ亜目マイルカ科の哺乳類。世界中の温帯，熱帯の外洋に分布するゴンドウクジラ型のイルカ。前頭部はほぼ垂直に立ち，前面には，縦のくぼみがある。くちばしはなく，歯は下あごにのみ数対ある。背びれは高く，体のほぼ中央にある。胸びれも比較的長い。幼体は，ほぼ全身黒褐色であるが，しだいに淡色となり，成体では淡灰色ないし白色となる。体表に仲間どうしの歯でできた引っかき傷が無数にあり松葉に似るので，マツバイルカの別名がある。

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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