![]() ![]() It is thought that multicellular animals first emerged around 800-900 million years ago in the Proterozoic Eon, but it wasn’t until the Cambrian Explosion(~542 MYA) at the start of the Phanerozoic Eon that animal life began to greatly diversify. Organize the appearance and/or flourishing of major invertebrate groups in geologic timeĪnimals are a monophyletic group descended from a common ancestral protist (recall that “protist” does not mean “single-celled eukaryote ” a protist is any eukaryote that is not classified as an animal, plant, or fungus). ![]() Use differences among key animal adaptations (listed above) to differentiate between invertebrate groups, including poriferans, cnidarians, protostomes (lophotrochozoans and ecdysozoans), and the invertebrate deuterostomes (echinoderms and invertebrate chordates). ![]()
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