Heterocercal tail

Japanese: heterocercal tail(英語表記)heterocercaltail
Heterocercal tail

…The scales are tiny, but have a hard enamel-like layer on the surface, with a bony base underneath. The tail fin has a large upper lobe and is a heterocercal tail. This heterocercal tail is a primitive form of tail fin, and is also seen in primitive groups of cartilaginous and bony fishes. …

*Some of the terminology that mentions "heterocercal tail" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…うろこは微小であるが,表面には硬いエナメル質様の層があり,その下に骨質の基盤がある。尾びれは上葉が大きく,異尾heterocercal tailである。この異尾は尾びれの形としては原始的であり,軟骨魚類や硬骨魚類の原始的なグループにも見られる形である。…

※「heterocercal tail」について言及している用語解説の一部を掲載しています。

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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