Protocercal
From BiblePortal Wikipedia
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.
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.