designating, of, or having a tail fin in which the upper lobe is larger than the lower and contains the upturned end of the spinal column, as in certain fishes, esp. sharks
Origin of heterocercal; from hetero- + Classical Greek kerkos, a tail + -al
Relating to, having, or being a tail fin in which the upper lobe is larger than the lower and the vertebral column extends into the upper lobe, as in sharks.
Origin of heterocercalhetero– + Greek kerkos, tail + –al1.
tail of a leopard shark
(comparative more heterocercal, superlative most heterocercal)