isocercal
adjective
iso·cer·cal
1
: having symmetrical upper and lower lobes and a gradually tapering vertebral column
—used of the tail fin of a fish
2
: having or relating to an isocercal tail fin
isocercy
noun
ˈ⸗⸗ˌsərsē
-rkē
plural -es
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Merriam-Webster unabridged
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