homocercal

adjective

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

   adj.all

   Antonyms heterocercal

   Source: WordNet 3.0

2. Having the tail nearly or quite symmetrical, the vertebral column terminating near its base; -- opposed to <i>heterocercal</i>.

   adjective

   Source: webster1913