A Census of the Determinable Genera of the StegocephaliaAmerican Philosophical Society, 1946 - 96 sider This is a print on demand edition of an important, hard-to-find publication. Over 180 illustrations. |
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A Census of the Determinable Genera of the Stegocephalia: Transactions of ... Ermine Cowles Case Ingen forhåndsvisning tilgjengelig - 2013 |
A Census of the Determinable Genera of the Stegocephalia: Transactions of ... Ermine Cowles Case Ingen forhåndsvisning tilgjengelig - 2013 |
Vanlige uttrykk og setninger
Adelospondyli Amphibia Anthracosauridae Archegosauridae basioccipital basipterygoid processes beds Benthosuchus Brachyopidae Branchiosauridae Branchiosaurus broad Capitosaurus Carboniferous characters Cornua absent Cornua formed denticles Diplocaulidae Diplocaulus ectopterygoid Edops Embolomeri Eogyrinus Eryopidae Eryops extends from orbit External nares small formed by tabular genera genus Girdles Huene Ichthyostegalia Ichthyostegids Intertemporal absent Intertemporal present Kuhn Labyrinthodonts Lachrymal Lachrymal extends Lachrymal touches Lepospondyli Limbs lower jaw Lower Permian Lower Triassic Loxommidae Mastodonsauridae maxillary row Microbrachidae Middle Triassic midlength of skull Moodie nares large Nyran occipital condyle orbit to naris Orbits large Orbits small ossified Otic notch Otic notch absent oval palatal row paralleling palatal vacuities paralleling the maxillary parasphenoid Permian peton Phyllospondyli postorbital pterygoid Rhachitomi Ribs Romer Säve-Söderberg Sculpture Scutes sensory canals septomaxillary slender Smith-Woodward snout South Africa specimens sphenoid squamosal Steen Stego Stegocephalia Stereospondyli supratemporal suture synonym Teeth Trimerorhachidae Trimerorhachis tusks on prevomer Urocordylidae vertebrae Watson Westphalian Wetlugasaurus widely separated Williston zone
Populære avsnitt
Side 416 - Watson when he wrote (1919, p. 300): "The curious way in which the structure of Seymouria is built up of perfectly well developed amphibian characters and equally decisive reptilian features, those of intermediate type being very rare, affords a magnificent example of the way in which the evolution of great groups may have taken place.
Side 327 - In addition to these growth-changes, the relation of the individual bones and their exposures on the outer surface of the skull are extremely variable; eg, the relation of the postfrontal, postorbital, and supratemporal; the lachrymal and the extent to which it enters into the external nares. This type of variation, which exists in all Amphibian species, exposes the fallacy of creating new species on slight proportional differences and variations in the exposures of individual bones.
Side 416 - ... rapid change of all the definite morphological entities of which it may be regarded as made up, the changes occurring quite independently and over a considerable time, the passage from the structure of the more primitive to the advanced group being quite gradual when viewed as a whole, but when further considered and analysed found to depend on a rapid evolution of separate regions apparently independent of each other.
Side 333 - As will be further demonstrated below (pp. 83, 88 — 92), the division of the younger Labyrinthodontia into "Rhachitomi" and ''Stereospondyli' is quite arbitrary and has no real systematic value. The fact seems to be that there is a general evolutionary trend towards a simplification of the vertebrae, so that in the Lower Triassic, various branches of the Labyrinthodontia, independently of each other, become
Side 416 - Cope's description of Conodectes is quite insufficient for recognition of the skull, and Seymouria is a name universally known, I propose to regard Conodectes as a nomen nudum and relegate it to the synonomy.
Side 416 - Labidosanrits, but differing so markedly from both as to merit a co-ordinate independent position for the genus, which I prefer to call of family value — the Seymouridae.
Side 327 - Any system of classification, then, merely represents the present state of our knowledge and the concensus of the opinions of those best qualified to decide as to their value, more or less influenced by the classifiers
Side 355 - Batrachiderpeton there are large pterygoids meeting in the middle line and supported by the basisphenoid, in Diplocaulus there are large interpterygoid vacuities and the pterygoids are supported by the parasphenoid.