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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.
Evidence for taphonomic size bias in the Dinosaur Park Formation (Campanian, Alberta), a model Mesozoic terrestrial alluvial-paralic system
An Exceptionally Preserved Three-Dimensional Armored Dinosaur Reveals Insights into Coloration and Cretaceous Predator-Prey Dynamics
The oldest North American pachycephalosaurid and the hidden diversity of small-bodied ornithischian dinosaurs.
- D. Evans, Ryan K. Schott, Derek W. Larson, Caleb M. Brown, M. Ryan
- Environmental Science, GeographyNature communications
- 7 May 2013
It is provided the first empirical evidence that the diversity of small-bodied ornithischian dinosaurs is strongly underestimated based on ghost lineages and the high proportion of robust and diagnostic frontoparietal domes compared with other pachycephalosaur fossils.
Testing of the effect of missing data estimation and distribution in morphometric multivariate data analyses.
A novel method is used to measure the introduced error of multiple techniques on a representative sample of extant crocodilian skulls, and Gower's distance was found to be the best performing non-estimation method, and Bayesian PCA the bestperforming estimation method.
New Data on the Diversity and Abundance of Small-Bodied Ornithopods (Dinosauria, Ornithischia) from the Belly River Group (Campanian) of Alberta
ABSTRACT Relative to large-bodied dinosaurs, the diversity of small-bodied dinosaurs from the Campanian of North America is poorly understood due to a lack of well-preserved skeletons. We document…
Cranial Ontogeny in Stegoceras validum (Dinosauria: Pachycephalosauria): A Quantitative Model of Pachycephalosaur Dome Growth and Variation
- Ryan K. Schott, D. Evans, M. Goodwin, J. Horner, Caleb M. Brown, N. Longrich
- Environmental Science, BiologyPloS one
- 29 June 2011
Cranial dome growth is positively allometric, proceeds from a flat-headed to a domed state, and confirms the synonymy of Ornatotholus browni as a juvenile Stegoceras.
Incomplete specimens in geometric morphometric analyses
The analysis of morphological diversity frequently relies on the use of multivariate methods for characterizing biological shape. However, many of these methods are intolerant of missing data, which…
Dental Disparity and Ecological Stability in Bird-like Dinosaurs prior to the End-Cretaceous Mass Extinction