ho·mo·cer·cal /ˌhoməˈsɚ/
Ho·mo·cer·cal a. Zool. Having the tail nearly or quite symmetrical, the vertebral column terminating near its base; -- opposed to heterocercal.
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homocercal
adj : possessing a symmetrical tail that extends beyond the end of
the vertebral column (as in most bony fishes) [ant: heterocercal]