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THE FIRST ANIMALS AND PLANTS
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abundant adapted amphibians anaspids ancestors animals appear appendages aquatic birds body bones bony brain calcareous Cambrian canines Carboniferous carnivores cavity characteristics cheek teeth claws corals creatures creodonts Cretaceous crinoids dentition deposits Devonian dinosaurs dorsal early echinoderms elongate Eocene eurypterids evolution extinct fact fauna feet long fish fossils ganoids genera genus graptolites habits hind ichthyosaurs incisors indicate insects invertebrates Jurassic known later legs less limbs living lower jaw mammals median Mesozoic Miocene modern molars mouth Museum natural North America notochord numerous oldest Oligocene Ordovician organisms origin ostracoderms pair Paleocene paleontologists Paleozoic pectoral pelvis Permian placentals plants plates Pleistocene Pliocene posterior pre-Cambrian premolars present preserved primitive probably pterosaurs region remains represented reptiles reptilian rocks scales segments shell short Silurian skeleton skull slender specialized species specimens spines strata structure suggests tail terrestrial Tertiary theropods toes Triassic trilobites ventral vertebrae wings