魚類學名詞

名詞 定義 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 尾鰭形狀之一，指下葉較大且比上葉更向後突出。內外部皆為不對稱的，例如：鰭甲魚綱(化石)。