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adaptive radiation Africa amphibians ancestors animals armor arthrodires artiodactyls birds body bones bony fishes canine carnivores Cenozoic characters cheek teeth comparatively continued cotylosaurs creodonts Cretaceous Cretaceous period crocodilians crossopterygians cusps Devonian dinosaurs dorsal early elongated Eocene epoch evolution evolutionary development evolutionary history evolved faunas feet fossil record front genera genus geologic giant gill heavy hind hoofed mammals horses ichthyosaurs incisors indicate insectivores Jurassic known labyrinthodonts land land-living vertebrates late later limbs lived lower jaw mammal-like reptiles mammalian mammals marine marsupials mastodonts Mesozoic middle Miocene modern molars North America numerous Oligocene Order ostracoderms paired fins Paleocene Paleozoic pelvis pelycosaurs Pennsylvanian perissodactyls Permian placentals placoderms Pleistocene plesiosaurs Pliocene premolars primitive probably proboscideans region rhinoceroses rodents sediments sharks skeleton skull South specialized spines strong Suborder Superfamily tail temporal opening Tertiary tetrapods thecodonts therapsids titanotheres toes tooth trend Triassic Triassic period ungulates upper vertebrates whales