Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/27547
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dc.contributor.authorBrown, Caleb Marshallen
dc.contributor.authorVanBuren, Collin Sen
dc.contributor.authorLarson, Derek Wen
dc.contributor.authorBrink, Kirstin Sen
dc.contributor.authorCampione, Nicolas Een
dc.contributor.authorVavrek, Matthew Jen
dc.contributor.authorEvans, David Cen
dc.date.accessioned2019-09-19T04:50:23Z-
dc.date.available2019-09-19T04:50:23Z-
dc.date.issued2015-04-
dc.identifier.citationJournal of Anatomy, 226(4), p. 322-333en
dc.identifier.issn1469-7580en
dc.identifier.issn0021-8782en
dc.identifier.urihttps://hdl.handle.net/1959.11/27547-
dc.description.abstractTooth counts are commonly recorded in fossil diapsid reptiles and have been used for taxonomic and phylogenetic purposes under the assumption that differences in the number of teeth are largely explained by interspecific variation. Although phylogeny is almost certainly one of the greatest factors influencing tooth count, the relative role of intraspecific variation is difficult, and often impossible, to test in the fossil record given the sample sizes available to palaeontologists and, as such, is best investigated using extant models. Intraspecific variation (largely manifested as size‐related or ontogenetic variation) in tooth counts has been examined in extant squamates (lizards and snakes) but is poorly understood in archosaurs (crocodylians and dinosaurs). Here, we document tooth count variation in two species of extant crocodylians (Alligator mississippiensis and Crocodylus porosus) as well as a large varanid lizard (Varanus komodoensis). We test the hypothesis that variation in tooth count is driven primarily by growth and thus predict significant correlations between tooth count and size, as well as differences in the frequency of deviation from the modal tooth count in the premaxilla, maxilla, and dentary. In addition to tooth counts, we also document tooth allometry in each species and compare these results with tooth count change through growth. Results reveal no correlation of tooth count with size in any element of any species examined here, with the exception of the premaxilla of C. porosus, which shows the loss of one tooth position. Based on the taxa examined here, we reject the hypothesis, as it is evident that variation in tooth count is not always significantly correlated with growth. However, growth trajectories of smaller reptilian taxa show increases in tooth counts and, although current samples are small, suggest potential correlates between tooth count trajectories and adult size. Nevertheless, interspecific variation in growth patterns underscores the importance of considering and understanding growth when constructing taxonomic and phylogenetic characters, in particular for fossil taxa where ontogenetic patterns are difficult to reconstruct.en
dc.languageenen
dc.publisherWiley-Blackwell Publishing Ltden
dc.relation.ispartofJournal of Anatomyen
dc.titleTooth counts through growth in diapsid reptiles: implications for interpreting individual and size-related variation in the fossil recorden
dc.typeJournal Articleen
dc.identifier.doi10.1111/joa.12280en
dc.identifier.pmid25689039en
dcterms.accessRightsBronzeen
local.contributor.firstnameCaleb Marshallen
local.contributor.firstnameCollin Sen
local.contributor.firstnameDerek Wen
local.contributor.firstnameKirstin Sen
local.contributor.firstnameNicolas Een
local.contributor.firstnameMatthew Jen
local.contributor.firstnameDavid Cen
local.subject.for2008060807 Animal Structure and Functionen
local.subject.for2008040308 Palaeontology (incl. Palynology)en
local.subject.for2008060301 Animal Systematics and Taxonomyen
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.subject.seo2008970104 Expanding Knowledge in the Earth Sciencesen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emailncampion@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.publisher.placeUnited Kingdomen
local.format.startpage322en
local.format.endpage333en
local.identifier.scopusid84926129126en
local.peerreviewedYesen
local.identifier.volume226en
local.identifier.issue4en
local.title.subtitleimplications for interpreting individual and size-related variation in the fossil recorden
local.access.fulltextYesen
local.contributor.lastnameBrownen
local.contributor.lastnameVanBurenen
local.contributor.lastnameLarsonen
local.contributor.lastnameBrinken
local.contributor.lastnameCampioneen
local.contributor.lastnameVavreken
local.contributor.lastnameEvansen
dc.identifier.staffune-id:ncampionen
local.profile.orcid0000-0002-4205-9794en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:1959.11/27547en
local.date.onlineversion2015-02-16-
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleTooth counts through growth in diapsid reptilesen
local.relation.fundingsourcenoteDinosaur Research Institute; NSERC Alexander Graham Bell Canada Graduate Scholarship; Ontario Graduate Scholarship; NSERC Discovery Granten
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorBrown, Caleb Marshallen
local.search.authorVanBuren, Collin Sen
local.search.authorLarson, Derek Wen
local.search.authorBrink, Kirstin Sen
local.search.authorCampione, Nicolas Een
local.search.authorVavrek, Matthew Jen
local.search.authorEvans, David Cen
local.uneassociationUnknownen
local.year.available2015en
local.year.published2015en
local.fileurl.closedpublishedhttps://rune.une.edu.au/web/retrieve/6e34ded2-2554-4452-9c33-56c58ea93958en
local.subject.for2020310911 Animal structure and functionen
local.subject.for2020370506 Palaeontology (incl. palynology)en
local.subject.for2020310401 Animal systematics and taxonomyen
local.subject.seo2020280102 Expanding knowledge in the biological sciencesen
local.subject.seo2020280107 Expanding knowledge in the earth sciencesen
Appears in Collections:Journal Article
School of Environmental and Rural Science
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