常見(jiàn)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(zhǎng)尾形尾鰭形狀在下麪的葉是較大的，與時(shí)常較上葉更曏後突出。不對(duì)稱(chēng)在外部以及內(nèi)部，例如鰭甲魚(yú)綱(化石)。 返回 hypocercal