常見例句hypocercal fin 反歪尾鰭hypocercal Caudal fin shape in which the lower lobe is larger and often more posteriorly directed than the upper lobe. Asymmetrical externally as well as internally, e.g. Pteraspides (fossil). 下葉長尾形尾鰭形狀在下面的葉是較大的，與時(shí)常較上葉更向后突出。不對稱在外部以及內(nèi)部，例如鰭甲魚綱(化石)。 返回 hypocercal