Basking shark (Cetorhinus maximus)

Japanese: ウバザメ(姥鮫) - ウバザメ（英語表記）Cetorhinus maximus

A marine fish of the Basking shark family in the Lamniformes order (illustration). Its teeth are so small that at first glance it appears toothless, and its long gill slits look like wrinkles, hence the name derives from the word uba, which means grandmother. It is also called baka-zame (baka shark) because it looks stupid, and tengu-zame (long-nosed shark) because its nose is sharp when young. Its English name is basking shark (meaning a shark basking in the sun). There is only one species in one family, one genus, and it is found in cold waters around the world, but in the waters around Japan it appears in coastal areas in early spring. It is characterized by its large body and gill slits that extend from the throat to the back.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ネズミザメ目ウバザメ科の海産魚（イラスト）。歯が小さく一見したところ歯がないように見え，また長い鰓孔（えらあな）がしわのように見えるので，おばあさんの意味の姥（うば）からこの名が生じた。愚鈍に見えるのでバカザメ，幼時には鼻先がとがるのでテングザメともいう。英名はbasking shark(ひなたぼっこをするサメの意)。世界に1科1属1種で，全世界の寒海部に多く，日本近海では春先に沿岸域に出現する。体が大きく，のどから背中までのびる鰓孔をもつのが特徴。

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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