Explanipedia

Osteohistology of the unusually fast‐growing theropod dinosaur <i>Ceratosaurus</i> Open

Riley S. Sombathy, Patrick M. O’Connor, Michael D. D’Emic · 2025

Ceratosaurus is a large‐bodied non‐avian theropod dinosaur known from the Upper Jurassic Morrison Formation of North America and is remarkable both for its exceptionally fast annual growth rate and its status as the only theropod currently…

R code and raw data Open

Michael D. D’Emic · 2023

Code and raw data

Supplemental_Dataset Open

Michael D. D’Emic · 2023

Dataset

New fossils, new ideas: selected contributions of vertebrate paleontology to scientific knowledge Open

Adriana López‐Arbarello, Michael D. D’Emic · 2022

Evolution of amniote dentine apposition rates Open

Stephen P. Finch, Michael D. D’Emic · 2022

In amniotes, daily rates of dentine formation in non-ever-growing teeth range from less than 1 to over 25 μm per day. The latter value has been suggested to represent the upper limit of odontoblast activity in non-ever-growing teeth, a hyp…

Dataset from Evolution of amniote dentine apposition rates Open

Stephen P. Finch, Michael D. D’Emic · 2022

Excel spreadsheet with daily dentine apposition rates, body mass estimates, and geological ages.

R code and raw data from Evolution of amniote dentine apposition rates Open

Stephen P. Finch, Michael D. D’Emic · 2022

Raw body mass, daily dentine apposition rates, and geologic ages, with R code to perform all analyses described herein.

Body size evolution of the first mammalian megaherbivore during Paleogene hyperthermal events, Wyoming Open

Michael D. D’Emic, Simone Hoffmann, Brady Z. Foreman · 2020

Correction: Evolution of high tooth replacement rates in theropod dinosaurs Open

Michael D. D’Emic, Patrick M. O’Connor, Thomas R. Pascucci, Joanna N. Gavras, Elizabeth Mardakhayava , et al. · 2019

[This corrects the article DOI: 10.1371/journal.pone.0224734.].

Evolution of high tooth replacement rates in theropod dinosaurs Open

Michael D. D’Emic, Patrick M. O’Connor, Thomas R. Pascucci, Joanna N. Gavras, Elizabeth Mardakhayava , et al. · 2019

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 broa…

Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA Open

Michael D. D’Emic, Matthew T. Carrano · 2019

Like many long‐standing dinosaur taxa, Brachiosaurus altithorax from the Upper Jurassic Morrison Formation of North America suffers from taxonomic issues stemming from a relatively incomplete holotype. Lack of anatomical overlap has preclu…

Scaling of statically derived osteocyte lacunae in extant birds: implications for palaeophysiological reconstruction Open

Orvil Grunmeier, Michael D. D’Emic · 2019

Osteocytes are mature versions of osteoblasts, bone-forming cells that develop in two ways: via ‘static’ osteogenesis, differentiating and ossifying tissue in situ to form a scaffold upon which other bone can form, or ‘dynamic’ osteogenesi…

Summary statistics from Scaling of statically derived osteocyte lacunae in extant birds: implications for paleophysiological reconstruction Open

Orvil Grunmeier, Michael D. D’Emic · 2019

Results of OLS and PGLS regressions

Supplementary material from "Scaling of statically derived osteocyte lacunae in extant birds: implications for paleophysiological reconstruction" Open

Orvil Grunmeier, Michael D. D’Emic · 2019

Osteocytes are mature versions of osteoblasts, bone-forming cells that develop in two ways: via ‘static’ osteogenesis, differentiating and ossifying tissue in situ to form a scaffold upon which other bone can form, or ‘dynamic’ oste…

A new fossil assemblage shows that large angiosperm trees grew in North America by the Turonian (Late Cretaceous) Open

Nathan A. Jud, Michael D. D’Emic, Scott A. Williams, Josh C. Mathews, Katie Tremaine , et al. · 2018

Fossils from Utah show large flowering trees evolved at least 15 million years earlier than previously thought.

Precocity in a tiny titanosaur from the Cretaceous of Madagascar Open

Kristina Curry Rogers, Megan R. Whitney, Michael D. D’Emic, Brian Bagley · 2016

Tiny giant Titanosaurs were the largest land vertebrates to have evolved, but even they had to start small. Curry Rogers et al. describe a baby Rapetosaurus only 35 cm at the hip at death. Histological and limb analysis suggest that this t…

A complex hyobranchial apparatus in a Cretaceous dinosaur and the antiquity of avian paraglossalia Open

Robert V. Hill, Michael D. D’Emic, Gabriel S. Bever, Mark A. Norell · 2015

The highly specialized feeding apparatus of modern birds is characterized in part by paraglossalia, triangular bones or cartilages in the tongue that constitute part of the rarely fossilized hyobranchial apparatus. Here, we report on a new…

Comment on “Evidence for mesothermy in dinosaurs” Open

Michael D. D’Emic · 2015

Grady et al . (Reports, 13 June 2014, p. 1268) suggested that nonavian dinosaur metabolism was neither endothermic nor ectothermic but an intermediate physiology termed “mesothermic.” However, rates were improperly scaled and phylogenetic,…

Unusual histology and morphology of the ribs of mosasaurs (Squamata) Open

Michael D. D’Emic, Kathlyn M. Smith, Zachary T. Ansley · 2015

We report the presence of two previously unrecognized features in the dorsal ribs of mosasaurs: first, the presence of extremely dense, pervasive extrinsic fibres (anchoring soft tissue to bone, sometimes called S harpey's fibres); and sec…

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