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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004009naa a2200469 4500
001oai:DiVA.org:uu-252189
003SwePub
008150504s2015 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2521892 URI
0247 a https://doi.org/10.1111/joa.122802 DOI
040 a (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Brown, Caleb Marshall4 aut
2451 0a Tooth counts through growth in diapsid reptiles :b implications for interpreting individual and size-related variation in the fossil record
264 c 2015-02-16
264 1b Wiley,c 2015
338 a print2 rdacarrier
520 a Tooth 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.
650 7a NATURVETENSKAPx Biologix Evolutionsbiologi0 (SwePub)106152 hsv//swe
650 7a NATURAL SCIENCESx Biological Sciencesx Evolutionary Biology0 (SwePub)106152 hsv//eng
653 a Alligator
653 a allometry
653 a Crocodylus
653 a dentition
653 a Diapsida
653 a Dinosauria
653 a Reptilia
653 a Varanus
7001 a VanBuren, Collin S.4 aut
7001 a Larson, Derek W.4 aut
7001 a Brink, Kirstin S.4 aut
7001 a Campione, Nicolas E.u Uppsala universitet,Paleobiologi,Evolution och utvecklingsbiologi4 aut0 (Swepub:uu)nicca643
7001 a Vavrek, Matthew J.4 aut
7001 a Evans, David C.4 aut
7102 a Uppsala universitetb Paleobiologi4 org
7730 t Journal of Anatomyd : Wileyg 226:4, s. 322-333q 226:4<322-333x 0021-8782x 1469-7580
8564 u https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/joa.12280
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-252189
8564 8u https://doi.org/10.1111/joa.12280

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