heterocercal

adjective
het·​ero·​cer·​cal | \ˌhe-tə-rō-ˈsər-kəl \

Definition of heterocercal 

1 of a fish tail fin : having the upper lobe larger than the lower with the vertebral column extending into the upper lobe

2 : having or relating to a heterocercal tail fin

First Known Use of heterocercal

1838, in the meaning defined at sense 1

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The first known use of heterocercal was in 1838

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