Anatomy
H
Homocercal Tail
/ /ˌhəʊməˈsɜːk(ə)l/ /
Etymology:
From Greek homos (same) + kerkos (tail)
Quick Definition
An externally symmetrical tail found in most modern bony fishes; the vertebral column terminates at the base of the fin rather than entering a lobe.
📖 Full Definition
A homocercal tail appears externally symmetrical, with equal dorsal and ventral lobes. Internally, the vertebral column terminates at the urostyle and does not extend into either lobe. This is the derived condition found in the vast majority of teleost fishes. The homocercal tail can generate thrust in any plane by adjusting fin curvature, providing manoeuvring advantages over the heterocercal design.
💡 Examples & Context
The forked, homocercal tail of a mackerel generates powerful forward thrust with minimal body flex.