homocercal fin

Thesaurus

Noun

1.homocercal fin - symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishescaudal fin, tail fin - the tail of fishes and some other aquatic vertebratesheterocercal fin - a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks

Homocercal Fin

the superficially symmetrical caudal fin of bony fish, in which the axial skeleton does not continue within the fin plate, which is formed from dermal rays alone. The homocercal fin arises in phylogenesis by means of the reduction of the axial skeleton in the upper lobe of the heterocercal fin. The internal asymmetry is retained inasmuch as the hypurals support the upper as well as the lower lobe.

homocercal fin

a type of fish tail fin that is symmetrical in shape, i.e. the upper and lower lobes are of similar size.

homocercal fin

Related to homocercal fin: heterocercal fin

noun

Antonyms for homocercal fin

noun symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes

Related Words

caudal fin
tail fin

Antonyms

heterocercal fin

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