Hypertext Webster Gateway: "homocercal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Homocercal \Ho`mo*cer"cal\, a. [Homo- + Gr. ? tail.] (Zo["o]l.)
Having the tail nearly or quite symmetrical, the vertebral
column terminating near its base; -- opposed to heterocercal.
From WordNet (r) 1.7 (wn)
homocercal
adj : (ichthyology) possessing a symmetrical tail that extends
beyond the end of the vertebral column (as in most bony
fishes) [ant: {heterocercal}]
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