heterocercal fin


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Related to heterocercal fin: homocercal, Paired fins, pelvic fin
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Noun1.heterocercal fin - a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharksheterocercal fin - a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks
caudal fin, tail fin - the tail of fishes and some other aquatic vertebrates
homocercal fin - symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes