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adj. Relating to, designating, or characterized by a tail fin having two symmetrical lobes extending from the end of the vertebral column, as in most bony fishes.

adj. Describing the symmetric tail of a fish that has two lobes extending from the end of the vertebral column.

adj. Having the tail nearly or quite symmetrical, the vertebral column terminating near its base; -- opposed to heterocercal.

In ichthyology, having the caudal fin symmetrical as to its upper and under halves: opposed to heterocercal. See heterocercal, diphycercal, hypural.

adj. possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes)

"The lecturer dwelt chiefly on the argument of Agassiz, which he summarises as follows: "Homocercal fishes have in their embryonic state heterocercal tails; therefore heterocercality is, so far, a mark of an embryonic state as compared with homocercality, and the earlier heterocercal fish are embryonic as compared with the later homocercal.""

protocercal    diphycercal    heterocercal