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Tetrapod - Skull | | Tetrapod - Skull: Encyclopedia II - Tetrapod - Skull | | The most notable characteristic that makes an amphibian skull different from a fishes' are the relative frontal and rear portion lengths. The fish had a long rear portion while the front was short; the orbital vacuities were thus located towards the anterior end. In the amphibian, the front of the skull lengthened, positioning the orbits farther back on the skull. The lacrimal bone was not in contact with the frontal anymore, having been separated from it by the prefrontal bone. Also of importance is that the skull was now free to rotate from side to side, independent of the ...
See also:Tetrapod, Tetrapod - Devonian Tetrapods, Tetrapod - Carboniferous Tetrapods, Tetrapod - Permian Tetrapods, Tetrapod - Classification of Tetrapods, Tetrapod - Anatomical features of early tetrapods, Tetrapod - Classification, Tetrapod - Skull, Tetrapod - Dentition, Tetrapod - Sensory Organs, Tetrapod - Hearing, Tetrapod - Girdles, Tetrapod - Limbs, Tetrapod - Feeding, Tetrapod - Respiration, Tetrapod - Locomotion | | | Tetrapod, Tetrapod - Anatomical features of early tetrapods, Tetrapod - Carboniferous Tetrapods, Tetrapod - Classification, Tetrapod - Classification of Tetrapods, Tetrapod - Dentition, Tetrapod - Devonian Tetrapods, Tetrapod - Feeding, Tetrapod - Girdles, Tetrapod - Hearing, Tetrapod - Limbs, Tetrapod - Locomotion, Tetrapod - Permian Tetrapods, Tetrapod - Respiration, Tetrapod - Sensory Organs, Tetrapod - Skull, Geologic timescale, Jennifer A. Clack, a paleontologist specializing in early tetrapods., Prehistoric life, Body form | | |
| | | Tetrapod: Encyclopedia II - Tetrapod - Skull
Tetrapod - Skull
The most notable characteristic that makes an amphibian skull different from a fishes' are the relative frontal and rear portion lengths. The fish had a long rear portion while the front was short; the orbital vacuities were thus located towards the anterior end. In the amphibian, the front of the skull lengthened, positioning the orbits farther back on the skull. The lacrimal bone was not in contact with the frontal anymore, having been separated from it by the prefrontal bone. Also of importance is that the skull was now free to rotate from side to side, independent of the spine, on the newly forming neck.
A diagnostic character of temnospondyls is that the tabular bones (which formed the posterior corners of the skull-table) were separated from the respective left and right parietals by a sutural junction between the postparietals and supratemporals. Also at the rear of the skull, all bones dorsal to the cleithrum were lost.
The lower jaw of, for example, Eryops resembled its crossopterygian ancestors in that on the outer surface lay a long dentary which bore teeth. There were also bones below the dentary on the jaw: two splenials, the angulary and the surangular. On the inside were usually three coronoids which bore teeth and lay close to the dentary. On the upper jaw was a row of marginal labyrinthine teeth, located on the maxilla and premaxilla. In Eryops, as in all early amphibians, the teeth were replaced in waves which traveled from the front of the jaw to the back in such a way that every other tooth was mature, and the ones in between were young.
Other related archives1990s, Acanthostega, Acanthostegidae, Amniota, Amphibia, Amphibians, Anapsida, Anthracosauria, Asia, Australia, Aves (Birds), Baphetidae, Batrachomorpha, Body form, Carboniferous, Chinese, Chordates, Devonian, Diapsida, Ears, Eryops, Europe, Fossils, Geologic timescale, Gondwanan, Greek, Greenland, Ichthyostegidae, Jennifer A. Clack, Labyrinthodonts, Lepospondyli, Mammalia, Mississippian, Ningxia Hui, North America, Palaeozoic, Pennsylvanian, Permian, Prehistoric life, Reptilia, Reptiliomorpha, Romer's Gap, Sarcopterygian, Sarcopterygii, Sauropsida, Synapsida, Temnospondyli, Triassic, Visean, alligator, amphibian, amphibians, analogue, animal, anthracosaurs, apparatus, aquatic, articulation, atmospheric, axolotl, backbone, baphetids, birds, body form, bones, brain, breathe, buoyancy, caecilians, carpals, carpus, cartilage, centrum, chemoreceptors, clavicle, coelacanth, crocodile, crocodiles, crown group, density, dentary, dentine, dentition, detritus, digit, dinosaurs, distal, dolphins, ear, ecosystems, elbow, enamel, environment, epithelium, evolution, evolved, eyeball, eyelids, feet, femur, fibula, fin, fishes, focal length, food, food webs, fossil, frequencies, freshwater, frog, frogs, genera, gill, gills, girdle, gravity, habitat, habitats, hands, humerus, hyoid, ichthyosaurs, impedance, inertia, invertebrates, jaw, knee, labyrinthodonts, lacrimal bone, lakes, lateral line, legs, lens, lifestyle, ligaments, light, limbs, lineages, liquid, lizards, locomotion, lung, lungs, mammals, matrix, maxilla, membrane, metacarpal, middle ear, mouth, mud, muscle, newts and salamanders, odors, olecranon, olfactory, orbital vacuities, order, organ, oxygen, paddles, palaeontologist, palatal, parietal bone, parietals, pectoral, pelvic, phalanges, phylogenetic, plants, predatory, premaxilla, pressure, prey, proximal, pubis, pulsations, quadruped, radius, red beds, refractive index, reptiles, respiration, rib cage, ribs, right angle, rocks, salamanders, sandstone, skin, skull, skulls, smells, snakes, sound, species, splenials, stapes, strength, supercontinent, swampy, swim bladder, tail, tarsus, tear ducts, teeth, temnospondyls, terrestrial, tibia, tissue, toads, toe, tongue, tooth, turtles, tympanum, ulna, vertebral, vertebral column, vertebrate, vertebrates, vibrations, water, wetland, whales
 Adapted from the Wikipedia article "Skull", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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