hypocercal

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)尾形尾鰭形狀在下面的葉是較大的，與時(shí)常較上葉更向后突出。不對(duì)稱(chēng)在外部以及內(nèi)部，例如鰭甲魚(yú)綱(化石)。
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