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Introduction to the Vertebrates
The Evolution of Fishes
18 other sections not shown
adult Africa amphibians ancestors animals apes appear aquatic archosaurs areas armor Asia Australia birds blood body bones bony brain braincase carnivores continents courtesy American Museum courtesy New York crossopterygians dinosaurs dwellers early eggs Eocene Europe evolution extinct feet fins fishes flesh-eaters forms fossil frog front gill habits head hind legs human ichthyosaurs known land lemurs limbs living lizards lower lungfish lungs mainly major mammals marine Mediterraneans modern Mongoloid monkeys mouth Museum of Natural Natural History Neanderthal Nordic North America northern notochord Old World Oligocene ostracoderms pair Paleozoic Photograph courtesy American Pleistocene plesiosaurs present primitive race region relatively reptiles reptilian rodents sharks similar skeleton skin skull snakes South southern species specimens structure tail teeth teleosts tend terrestrial tiny tion toes tooth Triassic tropical turtles types typical ungulates Upper Paleolithic vertebrates whales York Zoological Society