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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.
KGS Home > Earth Science Education. Devonian Period--Lobefins, Lungfish, Amphibians, and Tetrapod Evolution. Recent Findings Fishes with Legs, Devonian Times. Good summary of the fossil evidence for the evolution of fish to amphibians. A table is provided that includes the names of the known transitional tetrapods (four-legged animals) with links to summaries and Web sites for those animals.