Chondrichthyes III: Holocephali |
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Page 8
... structure suggests durophagy . The palatoquadrate is fused to the braincase and the man- dible is robust . The dentition consists entirely or in some part of tooth plates which are shed infrequently or retained and enlarged through life ...
... structure suggests durophagy . The palatoquadrate is fused to the braincase and the man- dible is robust . The dentition consists entirely or in some part of tooth plates which are shed infrequently or retained and enlarged through life ...
Page 22
... structure : Evolution Few investigators of holocephalian tooth structure fail to speculate concerning the evolution of the large plates that constitute the permanent dentition . Logic suggests that the plates evolved by fusion of ...
... structure : Evolution Few investigators of holocephalian tooth structure fail to speculate concerning the evolution of the large plates that constitute the permanent dentition . Logic suggests that the plates evolved by fusion of ...
Page 29
... structure of the neurocranium is not known in greater detail is not surprising : in the relatively few genera in which the skull is preserved , it is crushed or condensed dorsoventrally or laterally and generally not complete . Except ...
... structure of the neurocranium is not known in greater detail is not surprising : in the relatively few genera in which the skull is preserved , it is crushed or condensed dorsoventrally or laterally and generally not complete . Except ...
Common terms and phrases
aboral AGASSIZ arches Armagh bars 1 cm basal Bear Gulch Limestone BMNH boniferous Callorhinchus Carbonifer cartilage Chimaera chimaeriforms chimaeroids chondrichthyans clasper cochliodonts Cochliodus crown DAVIS Deltodus Deltoptychius denticles dentition descending lamina described distal dorsal fin spine DUFFIN Edaphodon edge elongated England fishes frontal clasper genus girdle Helodus holocephalians holotype hypermineralized tissue Illinois Iowa Ireland Ischyodus JOHN & WORTHEN Keokuk Keokuk Limestone labial labial margin lingual Louis Limestone Lower Carboniferous Visean Lower Jurassic LUND Maastrichtian mandibular plate mandibular tooth plate Menaspis mesial middle tritor midline MOY-THOMAS Myriacanthus neurocranium NEWBERRY & WORTHEN NMNH notochord OBRUCHEV occlusal surface occlusal view oral view outer tritor pair palatine tooth plate PATTERSON 1965B pectoral fin pelvic Poecilodus posterior radials referred region ridge Russia Scale bars Squaloraja structure symphyseal synarcual teeth tooth families Tournaisian trabecular dentine transverse tritor Type species type specimen Upper Carboniferous Upper Cretaceous Visean vomerine WOODWARD 1889D WOODWARD 1891A ZANGERL