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A universal scaling relationship between body mass and proximal limb bone dimensions in quadrupedal terrestrial tetrapods
The results provide a much-needed, robust, phylogenetically corrected framework for accurate and consistent estimation of body mass in extinct terrestrial quadrupeds, which is important for a wide range of paleobiological studies (including growth rates, metabolism, and energetics) and meta-analyses of body size evolution.
Rates of Dinosaur Body Mass Evolution Indicate 170 Million Years of Sustained Ecological Innovation on the Avian Stem Lineage
Early dinosaurs showed rapid evolutionary rates, which were sustained on the line leading to birds. Maintenance of evolvability in key lineages might explain the uneven distribution of trait…
Body mass estimation in non‐avian bipeds using a theoretical conversion to quadruped stylopodial proportions
A new equation that mathematically corrects the quadrupedal equations for use in bipeds is presented, derived from the systemic difference in the circumference-to-area scaling relationship of two circles (hypothetical quadruped) and one circle (Hypothetical biped), which represent the cross-section of the main weight-bearing limb bones.
Cranial Growth and Variation in Edmontosaurs (Dinosauria: Hadrosauridae): Implications for Latest Cretaceous Megaherbivore Diversity in North America
A decline in the disparity of dominant megaherbivores in the latest Maastrichtian interval supports the hypothesis that dinosaur diversity decreased immediately preceding the end Cretaceous extinction event.
Evidence for taphonomic size bias in the Dinosaur Park Formation (Campanian, Alberta), a model Mesozoic terrestrial alluvial-paralic system
Cope's rule and the adaptive landscape of dinosaur body size evolution
It is found that dinosaur evolution is constrained by attraction to discrete body size optima that undergo rare, but abrupt, evolutionary shifts, demonstrating that bimodality in the macroevolutionary adaptive landscape for land vertebrates has existed for more than 200 million years.
The last “pelycosaur”: a varanopid synapsid from the Pristerognathus Assemblage Zone, Middle Permian of South Africa
- S. Modesto, Roger M. H. Smith, N. Campione, R. Reisz
- Geography, Environmental ScienceNaturwissenschaften
- 19 October 2011
We report on a partial varanopid skull and mandible from the Pristerognathus Assemblage Zone of the Beaufort Group, in the South African Karoo Basin, which is probably latest Middle Permian…
Evolution of dinosaur epidermal structures
Using a comprehensive database of dinosaur skin traces, maximum-likelihood methods are applied to reconstruct the phylogenetic distribution of epidermal structures and interpret their evolutionary history.
A new species of mosasaur (Squamata: Mosasauridae) from the Pierre Shale (lower Campanian) of Manitoba
Plioplatecarpus nichollsae, sp. nov., from the lower Campanian (Pembina Member, Pierre Shale Formation) is diagnosed by the following: a thickened ventral rim of the external naris, a short…
Varanops brevirostris (Eupelycosauria: Varanopidae) from the Lower Permian of Texas, with Discussion of Varanopid Morphology and Interrelationships
ABSTRACT A comprehensive revision of Varanops brevirostris on the basis of a large, well-preserved specimen from a new Lower Permian locality in Texas provides valuable new anatomical information and…