[dinosaur] Dental histology of notosuchians from Bauru Group, Brazil

Ben Creisler
[email protected]


A new paper:

R. S. D. Ricart, R. M. Santucci, M. B. Andrade, C. E. M. Oliveira, W. R.
Nava & G. F. Degrazia (2019)
Dental histology of three notosuchians (Crocodylomorpha) from the Bauru
Group, Upper Cretaceous, South-eastern Brazil.
Historical Biology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1675057&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=7VWVrHFpU4xTrOjnCIuLbRbzhlY-qa5gdcfXwqkdonk&s=nTYLAVw0UtshNYF2RvbcJchgvACmz8u99MjyxO0w4gg&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1675057&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=7VWVrHFpU4xTrOjnCIuLbRbzhlY-qa5gdcfXwqkdonk&s=ygYaax9Ymq2m5p4fdvGguQ_0weDS5Z8NiNLSR19vsNI&e= 


The Upper Cretaceous Bauru Group deposits furnished several species of
Crocodylomorpha, especially notosuchians. However, little is known about
the feeding habits of this diverse group of crocodylomorphs. The dental
histology is a destructive approach that can provide important information
on tooth growth and feeding habits of fossil vertebrates. So far, few
studies dealt with crocodylomorph dental histology and the ones available
mainly focused on fossil and living neosuchians. In this work, we analyse
the dental histology of three notosuchians commonly found in the Upper
Cretaceous rocks of the Bauru Group: juvenile and adult Baurusuchidae, a
large Sphagesauridae, and Mariliasuchus amarali. Our analyses indicate that
tooth formation varied in these three taxa. In Mariliasuchus, a tooth took
less than 2 months to be completely grown. On the other hand, in
Sphagesauridae and Baurusuchidae, the tooth formation could take about 6
months to be completed. Mariliasuchus and Sphagesauridae have
proportionally thicker enamel in comparison to Baurusuchidae. Additionally,
the enamel thickness and its substantial development in the chewing area in
Sphagesauridae indicate that apical advanced notosuchians are more adapted
to process food items than more basal forms like Mariliasuchus.

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