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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