| a. | 1. | (Anat.) Having the vertebral column evidently continued into the upper lobe of the tail, which is usually longer than the lower one, as in sharks. |
| Adj. | 1. | heterocercal - possessing a tail with the upper lobe larger than the lower and with the vertebral column prolonged into the upper lobe Antonyms: homocercal - possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes) |
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