Dentary morphological variation in Clevosaurus brasiliensis (Rhynchocephalia, Clevosauridae) from the Upper Triassic of Rio Grande do Sul, Brazil

PloS One
Paula Rosario Romo de Vivar Martínez, Marina Bento Soares

Abstract

Clevosaurus was a cosmopolitan rhynchocephalian genus, known from the Late Triassic to the Early Jurassic. In South America this genus is represented by C. brasiliensis, an important component of the Linha São Luiz taphocoenosis, on the top of the Norian Santa Maria 2 Sequence of Southern Brazil. The best preserved and most abundant bone elements of C. brasiliensis are dentaries, in which variations of shape and size are observed. The aim of this study is to describe and evaluate the variation, using geometric morphometrics methods. Geometric morphometric analysis of 10 specimens highlights variations in relative size of the dentary. Most of the variation observed for PC1 (83.3%) is likely related to ontogeny, and PC2 (10.0%) is likely related to taphonomic signatures. The development patterns observed, such as the growth of the dentary, consists of differential growth in length between the posterior portion of the dentary, that grows at a higher rate, regarding the anterior portion of the element. This allometric growth is similar to what is observed in other rhynchocephalians and is accompanied by the allometric skull growth, similar to the trend exhibited by clevosaurs. The taphocoenosis is bimodal (juveniles and adults) wit...Continue Reading

References

Nov 5, 2003·Bioinformatics·Shigeyuki ObaShin Ishii
Jun 9, 2004·Journal of Human Evolution·Philipp MitteroeckerFred L Bookstein
Mar 9, 2007·Bioinformatics·Wolfram StackliesJoachim Selbig
Oct 25, 2007·Proceedings. Biological Sciences·Abby Grace Drake, Christian Peter Klingenberg
Aug 1, 2007·Integrative and Comparative Biology·Shawn E Vincent, Anthony Herrel

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Citations

Dec 9, 2020·Biological Reviews of the Cambridge Philosophical Society·Christopher T GriffinSterling J Nesbitt

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Methods Mentioned

BETA
PCA

Software Mentioned

Geomorph
R vs
R
pcaMethods
PASW

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