heterocercal fin
英汉例句
- 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。 - 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，躰表無鱗，有類似鰻魚尾鰭的很長的臀鰭。