Paleozoic Marine Community
Marine animals became common 550 million years ago and sea life evolved hard skeletons, such as internal or external shells. Common invertebrates of these early reefs included trilobites, brachiopods (lampshells), bivalves, cephalopods (Orthoceras), crino
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Arthropods Artwork Bivalve Bivalves Bivalvia Brachiopod Brachiopoda Cephalopod Cephalopoda Cephalopods Cnidaria Cnidarian Cnidarians Corals Crinoid Crinoids Echinoderm Echinodermata Echinoderms Evolution Extinct Extinction Illustrated Illustration Illustrations Invertebrates Lilies Lily Mollusca Mollusk Mollusks Painting Palaeozoic Paleozoic Porifera Prehistoric Prehistory Reconstruction Reconstructions Seascape Seascapes Sponge Sponges Trilobite Trilobites
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