Evolution of high tooth replacement rates in theropod dinosaurs


Autoři: Michael D. D’Emic aff001;  Patrick M. O’Connor aff003;  Thomas R. Pascucci aff001;  Joanna N. Gavras aff001;  Elizabeth Mardakhayava aff001;  Eric K. Lund aff003
Působiště autorů: Department of Biology, Adelphi University, Garden City, New York, United States of America aff001;  Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York, United States of America aff002;  Department of Biomedical Sciences, Ohio University, Athens, Ohio, United States of America aff003;  Ohio Center for Ecology and Evolutionary Studies, Athens, Ohio, United States of America aff004;  Department of Biological Sciences, North Carolina Museum of Natural Sciences, Raleigh, North Carolina, United States of America aff005
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224734

Souhrn

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.

Klíčová slova:

Computed axial tomography – Dentition – Dinosaurs – Herbivory – Phylogenetics – Teeth – Theropoda – Sauropoda


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Článek vyšel v časopise

PLOS One


2019 Číslo 11