Evolution of the Vertebrates: A History of the Backboned Animals Through Time |
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Page 14
... genus . The genus Isurus , for instance , con- tains the various mackerel sharks . Below the genus is the species ; the Mediterranean mackerel shark is Isurus oxyrhynchus . The species is the basic unit of ' classification . It ...
... genus . The genus Isurus , for instance , con- tains the various mackerel sharks . Below the genus is the species ; the Mediterranean mackerel shark is Isurus oxyrhynchus . The species is the basic unit of ' classification . It ...
Page 103
... genus , Microbrachis . Still other lepospondyls of the late Paleozoic were small , elongated snake - like amphibians in which the legs were suppressed . The genus Ophiderpeton of Pennsylvanian age was a characteristic member of this ...
... genus , Microbrachis . Still other lepospondyls of the late Paleozoic were small , elongated snake - like amphibians in which the legs were suppressed . The genus Ophiderpeton of Pennsylvanian age was a characteristic member of this ...
Page 112
... genus about a foot or so in length . In this genus , as in all the captorhinomorphs , the skull was truncated at the back , and the quadrate bone for the support of the lower jaw was vertical in position . The jaws were very long , with ...
... genus about a foot or so in length . In this genus , as in all the captorhinomorphs , the skull was truncated at the back , and the quadrate bone for the support of the lower jaw was vertical in position . The jaws were very long , with ...
Contents
INTRODUCTION | 1 |
JAWLESS VERTEBRATES | 11 |
SUCCESS OF THE FISHES | 42 |
Copyright | |
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adaptive radiation Africa amphibians ancestors animals armor arthrodires artiodactyls birds body bones bony fishes brain canine carnivores Cenozoic cheek teeth comparatively continued 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 head shield heavy hind hoofed mammals horns horses ichthyosaurs ichthyostegids incisors indicate insectivores Jurassic known labyrinthodonts land land-living vertebrates late limbs litopterns lived lower jaw lungfishes mammal-like mammalian mammals marine marsupials mastodonts Mesozoic middle Miocene modern North America notoungulates numerous Oligocene Order ostracoderms paired fins Paleocene Paleozoic pelvis perissodactyls Permian placentals placoderms Pleistocene Pliocene premolars primitive probably proboscideans region reptiles rhinoceroses rodents sediments sharks Silurian skeleton skull South specialized strong Suborder Superfamily tail teleosts temporal opening Tertiary tetrapods therapsids titanotheres toes tooth trend Triassic Triassic period ungulates upper vertebrates whales