Many fish of the Paleozoic developed external armor that protected them from predators. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms.
Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts.
Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Jawless fish † Armoured fish † Spiny sharks Cartilaginous fish Bony fish Ray-finned fish Lobe-finned fishĬladistically included but traditionally excluded taxaĪ fish ( PL: fish or fishes) is an aquatic, craniate, gill-bearing animal that lacks limbs with digits. Diversity of various fishes including Sharks, Stingrays, Bony fishes, Jawless fishes, and Coelacanths.
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