A marine turtle of the family Chelonidae (illustration), whose shell is used as tortoiseshell for crafts. It can reach a carapace length of 70-90cm and a weight of 120kg. It lives in the warm waters of the Pacific, Indian and Atlantic Oceans, and sometimes comes ashore to lay eggs in some of the Ryukyu Islands in Japan. It lays about 160 eggs at a time. The scales on its carapace overlap like a tile, but as it grows it becomes smooth and arranged like paving stones. The front end of the upper jaw is curved like a hook, and it is used to catch fish, crustaceans, mollusks, etc., but it also eats algae. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
甲がべっこうとして細工物の材料とされるウミガメ科の海生ガメ(イラスト)。甲長70~90cm,体重120kgに達する。太平洋,インド洋,大西洋の暖かい海にすみ,日本では南西諸島の一部に産卵のため上陸することもある。産卵数は一度に160個ほど。背甲の鱗板は覆瓦(ふくが)状に重なり合うが,成長すると敷石状に配列して滑らかとなる。上あごの前端は鉤(かぎ)状に曲がり,魚,甲殻類,軟体動物などをとらえるが,藻類を食べることもある。
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