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  • Webster's Revised Unabridged Dictionary
    • a Protocercal (Zoöl) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal.
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Century Dictionary and Cyclopedia
    • protocercal Having a primitive tail-fin: noting the embryonic stage of the vertical fins and tail of a fish, when these consist of a continuous skinfold along both upper and under sides of the body and around its tail-end.
    • ***


Webster's Revised Unabridged Dictionary
Proto-, + Gr. the tail


In literature:

The last mentioned is of the primitive protocercal type.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8" by Various
The tail at first is symmetrical, having a form which has been called diphycercal or protocercal.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour