homocercal
/ˌhɒməʊˈsɜːkəl/adjective
- Zoology (of a fish's tail) appearing outwardly symmetrical but with the backbone passing into the upper lobe, as in all higher fish【动】（鱼尾）正型的。与 DIPHYCERCAL, HETEROCERCAL相对。
词源
mid 19th cent.: from homo- 'same'+Greek kerkos 'tail' + -AL.