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1 May 2011 The Structure and Phylogenetic Distribution of Amniote Plicidentine
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Abstract

Plicidentine, infolded dentine around the pulp cavity at the base of a tooth, has been histologically characterized in sarcopterygians, basal tetrapods, and the actinopterygian Lepisosteus. Within amniotes, however, its phylogenetic distribution is much less well documented and its morphological variability has not been described, in spite of the fact that plicidentine is considered a synapomorphy of three major clades of amniotes (Neochoristodera, Ichthyosauria, and Varanoidea). In this study, we provide a summary of the taxonomic distribution of plicidentine in amniotes, and also describe the morphological variation encompassed by this term. We conclude that plicidentine, as defined here, has evolved independently several times in amniotes, and that each occurrence is histologically distinct.

© 2011 by the Society of Vertebrate Paleontology
Erin E. Maxwell, Michael w. Caldwell, and Denis O. Lamoureux "The Structure and Phylogenetic Distribution of Amniote Plicidentine," Journal of Vertebrate Paleontology 31(3), 553-561, (1 May 2011). https://doi.org/10.1080/02724634.2011.557117
Received: 5 September 2010; Accepted: 1 January 2011; Published: 1 May 2011
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