adjective Ichthyology.
having an unequally divided tail, characteristic of sharks, rays, and skates.

1830–40; hetero- + Greek kérk(os) a tail + -al1

heterocercality [het-er-oh-ser-kal-i-tee] , noun
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World English Dictionary
heterocercal (ˌhɛtərəʊˈsɜːkəl)
ichthyol Compare homocercal of or possessing a tail in which the vertebral column turns upwards and extends into the upper, usually larger, lobe, as in sharks
[C19: from hetero- + Greek kerkos tail]

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Example sentences
The tail is heterocercal with the upper lobe much larger than the rounded lower lobe.
These fish have a heterocercal tail in which the backbone extends into the upper fork of the caudal fin.
Sturgeon tails are heterocercal, meaning the upper lobe of the tail is much longer than the lower lobe.
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