heterocercal
Adjective
Meaning
Having the vertebral column evidently continued into the upper lobe of the tail, which is usually longer than the lower one, as in sharks.
Source: Webster's dictionaryAntonyms
Related terms
Examples
Sharks possess a heterocercal caudal fin in which the dorsal portion is usually noticeably larger than the ventral portion.
One of the primary characteristics present in most sharks is the heterocercal tail, which aids in locomotion. citation Body covering Chondrichthyans have toothlike scales called dermal denticles or placoid scales.