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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
The early evolution of fish is unclear. It is thought that they evolved in the Cambrian Period (542 - 488 Ma). A primitive fish called Haikouichthys which is commonly recognis â¦ ed as one of the 1st fish to evolve lived around 530 million years ago.