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  1. Phylogeny of the chelydrid turtles : a study of shared derived characters in the skull / Eugene S. Gaffney --.
    By: Gaffney, Eugene S.
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Anatomy  Classification  Reptiles  Skull  Snapping turtles  Turtles  
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  1. A staurotypine skull from the Oligocene of South Dakota (Testudinata, Chelydridae)
    By: Williams, Ernest E. (Ernest Edward)
    Type: Article
    In: Breviora.
    Volume: no.1-66 (1952-1956)
    Issue: 2
    Date: 1952
    Page Range: 1-16
    Publication info: Cambridge, Mass. :Museum of Comparative Zoology, Harvard University, [1952-
    Subjects: Anatomy  Fossils  Skull  Snapping turtles  South Dakota  Testudinidae, Fossil  Turtles, Fossil  
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