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[dinosaur] Variation in the Dentition of Coelophysis bauri (2014) (free pdf)





Ben Creisler
bcreisler@gmail.com

The website for the New Mexico Museum of Natural History Bulletin recently posted issues 62 through 68 (2014-2015) in open access.

http://econtent.unm.edu/cdm/search/collection/bulletins/order/subjec/page/2

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Some of the papers in these volumes have been mentioned on DML, but others have not been mentioned. I will sort through them to highlight papers not yet mentioned. 

There are a number of dinosaur-related items in the issues of the Bulletin that have been available through Research Gate and other sites. However, some papers were not available online before.

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One important paper not previously mentioned on the DML and now free is the following:

Lisa G. Buckley and Philip J. Currie (2014)
Variation in the Dentition of Coelophysis bauri. 
New Mexico Museum of Natural History and Science Bulletin 63: 73 pp
http://econtent.unm.edu/cdm/compoundobject/collection/bulletins/id/3739/rec/65



Isolated theropod teeth provide useful data for paleogeographic and paleoecologic studies, although tooth morphotypes with ambiguous taxonomic affinity are frequently recovered from Late Cretaceous microfossil localities. It is not known if these morphotypes result from individual or ontogenetic variation within known theropod taxa from the Late Cretaceous. To test whether ontogenetic variation could produce seemingly novel tooth morphologies, 848 teeth from 23 skulls of the Late Triassic (Apachean) theropod Coelophysis bauri from Ghost Ranch, New Mexico, were analyzed using statistical and multivariate analyses. Principal component and discriminant analyses reveal that, despite heterodontic morphology, premaxillary, maxillary, and dentary teeth, and teeth from small (juvenile) and large (adult) skulls occupy a similar morphospace and would not be mistakenly identified as new taxa. However, canonical variate analyses show that teeth from small and large skulls are significantly different. Teeth with longitudinal ridging that only occur in small (juvenile) skulls occupy the same morphospace as non-ridged teeth, and may be an ontogenetically controlled character of tooth morphology in C. bauri. Ridged tooth morphotypes from Late Cretaceous microfossil localities may be ontogenetic variants of known theropod taxa.