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

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dc.contributor.authorZaher, Hussam.en_US
dc.contributor.authorRieppel, Olivier.en_US
dc.date.accessioned2005-10-06T16:48:03Z
dc.date.available2005-10-06T16:48:03Z
dc.date.issued1999en_US
dc.description19 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes 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.extent7775309 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/3047
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3271en_US
dc.subject.lccQL1 .A436 no.3271, 1999en_US
dc.subject.lcshSquamata -- Anatomy.en_US
dc.subject.lcshTeeth.en_US
dc.subject.lcshMosasauridae.en_US
dc.subject.lcshSnakes -- Evolution.en_US
dc.titleTooth implantation and replacement in squamates, with special reference to mosasaur lizards and snakes. American Museum novitates ; no. 3271en_US
dc.typetexten_US

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