Fin

fin|fin

Poisson

A Nageoire is a Appendice provided with rays and veils inter-rays tended, used by the fish to be driven. There are several types: ; Odd fins: Fins dorsal, caudal, anal… ; Even fins: Fins pectoral, pelvic. The even fins are bodies homologous S with the members walkers of tétrapodes.

A pallet is the final part of the fin. Of flattened, full and round form, she recalls the end of an oar and is used to swim.

Fins of the mammals and marine reptiles

In the marine mammals (Cetacea S, Pinnipède S) and the reptiles marine (turtles, Ichtyosaure S), the fins (at least the pectoral ones) derive from the leg of their ancestor terrestrial Tétrapode.

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