protocercal

Protocercal

Pro`to*cer"cal\, a. [Proto- + Gr. ? the tail.] (Zo["o]l.) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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