heterocercal fin
英漢例句
- The lower lobe of the deeply forked caudal fin is longer than the upper lobe.
尾鰭深叉型，下葉比上葉長(zhǎng)。 - Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin.
東半球的淡水鲇魚(yú)，體表無(wú)鱗，有類似鰻魚(yú)尾鰭的很長(zhǎng)的臀鰭。