heterocercal fin的用法和样例：

例句

The lower lobe of the deeply forked caudal fin is longer than the upper lobe.尾鳍深叉型，下叶比上叶长。
Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin.东半球的淡水鲇鱼，体表无鳞，有类似鳗鱼尾鳍的很长的臀鳍。

【反义词】

homocercal fin正尾鳍

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