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Tooth implantation and replacement in squamates, with special reference to mosasaur lizards and snakes. American Museum novitates ; no. 3271

Show simple item record Zaher, Hussam. en_US Rieppel, Olivier. en_US 2005-10-06T16:48:03Z 2005-10-06T16:48:03Z 1999 en_US
dc.description 19 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 16-18). en_US
dc.description.abstract "Different modes of tooth implantation in squamates are reviewed and defined. Three basic types of tooth implantation are recognized in reptiles: acrodonty, thecodonty, and pleurodonty. Only acrodonty and pleurodonty are present in squamates. Variations of the pleurodont con-dition include full pleurodonty, labial pleurodonty, and subpleurodonty. Tooth implantation and replacement in mosasaur lizards and snakes are reviewed in order to evaluate previously proposed character definitions and hypotheses of primary homologies for three distinct characters associated with tooth replacement-the presence or absence of resorption pits, a recumbent or upright position of the replacement teeth, and the mode of tooth attachment to the bone. The first character is shown to be uninformative in respect to the controversy surrounding Mosasauroidea-snake affinities. Mosasaurs show replacement teeth in a normal upright position, and the occasional presence of recumbent teeth is the result of postmortem displacement. Finally, the mode of tooth attachment in snakes and mosasaurs is fundamentally different. The highly modified condition of tooth implantation described for the alethinophidian snakes is suggested to represent an additional synapomorphy of this taxon at the exclusion of the scolecophidians, which retain the plesiomorphic, fully pleurodont, lizard condition. The lower Middle Cretaceous fossil snake Pachyrhachis shows the alethinophidian type of tooth implantation"--P. [1]. en_US
dc.format.extent 7775309 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3271 en_US
dc.subject.lcc QL1 .A436 no.3271, 1999 en_US
dc.subject.lcsh Squamata -- Anatomy. en_US
dc.subject.lcsh Teeth. en_US
dc.subject.lcsh Mosasauridae. en_US
dc.subject.lcsh Snakes -- Evolution. en_US
dc.title Tooth implantation and replacement in squamates, with special reference to mosasaur lizards and snakes. American Museum novitates ; no. 3271 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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