The Tyrant Lizard King, Queen and Emperor: Multiple Lines of Morphological and Stratigraphic Evidence Support Subtle Evolution and Probable Speciation Within the North American Genus Tyrannosaurus

@article{Paul2022TheTL,
  title={The Tyrant Lizard King, Queen and Emperor: Multiple Lines of Morphological and Stratigraphic Evidence Support Subtle Evolution and Probable Speciation Within the North American Genus Tyrannosaurus},
  author={Gregory Paul and W Scott Persons and Jay Raalte},
  journal={Evolutionary Biology},
  year={2022},
  pages={1-24}
}
All skeletal specimens of the North American dinosaur Tyrannosaurus and a number of trace fossils have been attributed to the single species: T. rex . Although an unusual degree of variation in skeletal robustness among specimens and variability in anterior dentary tooth form have been noted, the possibility of sibling species within the genus Tyrannosaurus has never been tested in depth in both anatomical and stratigraphic terms. New analysis, based on a dataset of over three dozen specimens… 

Taphonomic and Diagenetic Pathways to Protein Preservation, Part II: The Case of Brachylophosaurus canadensis Specimen MOR 2598

Simple Summary Reports of the recovery of proteins and other molecules from fossils have become so common over the last two decades that some paleontologists now focus almost entirely on studying how

Allometric growth in the frontals of the Mongolian theropod dinosaur Tarbosaurus bataar

Allometric growth in the frontals of the Mongolian theropod dinosaur Tarbosaurus bataar . Acta Palaeontologica Polonica 67 (X): xxx–xxx. Tarbosaurus bataar is a sister taxon of the well-studied

Enduring senses

The meanings of words seem to change over time. But while there is a growing body of literature in linguistics and philosophy about meaning change, there has been little discussion about the

References

SHOWING 1-10 OF 43 REFERENCES

A long-snouted, multihorned tyrannosaurid from the Late Cretaceous of Mongolia

This specimen conclusively demonstrates that Alioramus is a small, gracile, long-snouted carnivore that deviates from other tyrannosaurids in its body plan and presumably its ecological habits, and increases the range of morphological diversity in one of the most familiar extinct clades.

The phylogeny and evolutionary history of tyrannosauroid dinosaurs

The phylogenies illustrate that the body plan of the colossal species evolved piecemeal, imply no clear division between northern and southern species in western North America as had been argued, and suggest that T. rex may have been an Asian migrant to North America.

A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system

A new species of Tyrannosaurid from the upper Two Medicine Formation of Montana supports the presence of a Laramidian anagenetic (ancestor-descendant) lineage of Late Cretaceous tyrannosaurids, suggesting that anagenesis could have been a widespread mechanism generating species diversity amongst dinosaurs, and perhaps beyond.

An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex

An extremely large and relatively complete (roughly 65%) skeleton of Tyrannosaurus rex (RSM P2523.8) is described, offering support for prior hypotheses that a sampling bias occurs throughout the Dinosauria, making it likely that most taxa grew to significantly greater size than current known specimens indicate.

Evolutionary trends in Triceratops from the Hell Creek Formation, Montana

This research indicates that the two currently recognized species of Triceratops are stratigraphically separated and that the evolution of this genus likely incorporated anagenetic (transformational) change, which impact interpretations of dinosaur diversity at the end of the Cretaceous and illuminate potential modes of evolution in the Dinosauria.

A high-resolution growth series of Tyrannosaurus rex obtained from multiple lines of evidence

The extreme number of changes at the transition between juveniles and subadults shows that the ontogeny of T. rex exhibits secondary metamorphosis, analogous to the abrupt ontogenetic changes that are seen at sexual maturity among teleosts.

New Latest Cretaceous Mammals from Northeastern Colorado with Biochronologic and Biogeographic Implications

ABSTRACT Few latest Cretaceous mammalian faunas are known from the central part of the Western Interior of North America. Here we report a collection of 28 mammalian fossils (23 isolated teeth, 5

Tyrannosaur Life Tables: An Example of Nonavian Dinosaur Population Biology

The size and age structures for four assemblages of North American tyrannosaurs—Albertosaurus, Tyrannosaurus, Gorgosaurus, and Daspletosaurus—reveal a pronounced, bootstrap-supported pattern of

Recognizing sexual dimorphism in the fossil record: lessons from nonavian dinosaurs

This study revisits prior analyses that purport to find quantitative evidence for sexual dimorphism in nine dinosaur species and presents the first statistical investigation of sexualDimorphism across Dinosauria.