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Definition of Protocercal
1. a. Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal.
Definition of Protocercal
1. Adjective. (zoology) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal. ¹
¹ Source: wiktionary.com