Examples from the Web for heterocercal
The tail is diphycercal, heterocercal, or else it degenerates into a whip-like organ, a form which has been called leptocercal.
The tail may be heterocercal, as in Acipenser, or diphycercal as in Polypterus.The Vertebrate Skeleton|Sidney H. Reynolds
In Dipterus there are no marginal teeth, and the tail is heterocercal, not diphycercal, as in the other Dipnoans generally.
The tail is slender and heterocercal, the caudal fin deeply forked.
The heterocercal tail is one in which the hindmost vertebræ are bent upwards.