[dinosaur] Theropod high tooth replacement rate evolution (free pdf)

Ben Creisler
[email protected]

A new paper in open access:


Michael D. D’Emic, Patrick M. O’Connor, Thomas R. Pascucci, Joanna N.
Gavras, Elizabeth Mardakhayava & Eric K. Lund (2019)
Evolution of high tooth replacement rates in theropod dinosaurs.
PLoS ONE 14(11): e0224734.
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1371_journal.pone.0224734&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=15dP0Hgbn-IdhvP4MGw0a_9HntOIi22sgPHqe8qbBpc&s=0w6Uh4V4BjGjA16dfyg9E-lo0lIhXYp_Mc5ckQ2Xe6E&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_plosone_article-3Fid-3D10.1371_journal.pone.0224734&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=15dP0Hgbn-IdhvP4MGw0a_9HntOIi22sgPHqe8qbBpc&s=GDSJBd0uyD33Avh6k7cRqXRlOQdPDr3Eiq9sGnuKyZ8&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_plosone_article_file-3Fid-3D10.1371_journal.pone.0224734-26type-3Dprintable&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=15dP0Hgbn-IdhvP4MGw0a_9HntOIi22sgPHqe8qbBpc&s=8Q91yF-xcwxtJCptCQnrYnjL4RG-ka89gjTrIr89dBw&e= 

Tooth replacement rate is an important contributor to feeding ecology for
polyphyodont animals. Dinosaurs exhibit a wide range of tooth replacement
rates, mirroring their diverse craniofacial specializations, but little is
known about broad-scale allometric or evolutionary patterns within the
group. In the current broad but sparse dinosaurian sample, only three
non-avian theropod tooth replacement rates have been estimated. We
estimated tooth formation and replacement rates in three additional
non-avian theropod dinosaurs, the derived latest Cretaceous abelisaurid
Majungasaurus and the more generalized Late Jurassic Allosaurus and
Ceratosaurus. We created the largest dental histological and CT dataset for
any theropod dinosaur, sectioning and scanning over a dozen toothed
elements of Majungasaurus and several additional elements from the other
two genera. Using this large sample, we created models of tooth formation
time that allow for theropod replacement rates to be estimated
non-destructively. In contrast to previous results for theropods, we found
high tooth replacement rates in all three genera, with Allosaurus and
Ceratosaurus rates of ~100 days and 56 days for Majungasaurus. The latter
rate is on par with those of derived herbivorous dinosaurs including some
neosauropods, hadrosaurids, and ceratopsians. This elevated rate may be a
response to high rates of tooth wear in Majungasaurus. Within Dinosauria,
there is no relationship between body mass and tooth replacement rate and
no trends in replacement rate over time. Rather, tooth replacement rate is
clade-specific, with elevated rates in abelisaurids and diplodocoids and
lower rates in coelurosaurs.

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News:

Flesh-ripping dinosaurs replaced their teeth multiple times a year

https://urldefense.proofpoint.com/v2/url?u=https-3A__www.smithsonianmag.com_science-2Dnature_flesh-2Dripping-2Ddinosaurs-2Dreplaced-2Dtheir-2Dteeth-2Dmultiple-2Dtimes-2Dyear-2D180973661_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=15dP0Hgbn-IdhvP4MGw0a_9HntOIi22sgPHqe8qbBpc&s=p9xoOOtk5ao2tSIVYTZagKkjTNYuDIlNj5qrim9jZNY&e=