Results 41 to 50 of about 1,623 (162)

Growth dynamics of Australia's polar dinosaurs. [PDF]

PLoS ONE, 2011
Analysis of bone microstructure in ornithopod and theropod dinosaurs from Victoria, Australia, documents ontogenetic changes, providing insight into the dinosaurs' successful habitation of Cretaceous Antarctic environments.
Holly N Woodward, Thomas H Rich, Anusuya Chinsamy, Patricia Vickers-Rich   +3 more
doaj   +1 more source

Pendraig milnerae, a new small-sized coelophysoid theropod from the Late Triassic of Wales

Royal Society Open Science, 2021
We describe a new small-bodied coelophysoid theropod dinosaur, Pendraig milnerae gen. et sp. nov, from the Late Triassic fissure fill deposits of Pant-y-ffynnon in southern Wales.
Stephan N. F. Spiekman, Martín D. Ezcurra, Richard J. Butler, Nicholas C. Fraser, Susannah C. R. Maidment   +4 more
doaj   +1 more source

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Reply: Theropod-bird link reconsidered [PDF]

Nature, 1998
Norell et al. reply — First, maniraptoran theropods, and theropods with furculae, are known from the Late Jurassic period7,8, significantly closing the ‘gap’ discussed above. We did not say in our Scientific Correspondence1 that Velociraptor was a direct ancestor, only that dromaeosaurs are related to birds.
Mark A. Norell, Peter Makovicky, James A. Clark   +2 more
openaire   +1 more source

High frequencies of theropod bite marks provide evidence for feeding, scavenging, and possible cannibalism in a stressed Late Jurassic ecosystem.

PLoS ONE, 2020
Bite marks provide direct evidence for trophic interactions and competition in the fossil record. However, variations in paleoecological dynamics, such as trophic relationships, feeding behavior, and food availability, govern the frequency of these ...
Stephanie K Drumheller, Julia B McHugh, Miriam Kane, Anja Riedel, Domenic C D'Amore   +4 more
doaj   +1 more source

Skeletal pathologies in extant crocodilians as a window into the paleopathology of fossil archosaurs

The Anatomical Record, EarlyView.
Abstract Crocodilians, together with birds, are the only extant relatives to many extinct archosaur groups, making them highly important for interpreting paleopathological conditions in a phylogenetic disease bracketing model. Despite this, comprehensive data on osteopathologies in crocodilians remain scarce.
Alexis Cornille, Kyla Beguesse, Ewan Wolff, Clemens Zinner, Patrick Asbach, François Clarac, Florian Witzmann   +6 more
wiley   +1 more source

Chimerism in specimens referred to Saurophaganax maximus reveals a new species of Allosaurus (Dinosauria, Theropoda)

Vertebrate Anatomy, Morphology, Palaeontology
Saurophaganax maximus is the designation of a massive theropod dinosaur recovered from the Kenton Member of the Upper Jurassic Morrison Formation in Oklahoma.
Andrew Danison, Mathew Wedel, Daniel Barta, Holly Woodward, Holley Flora, Andrew Lee, Eric Snively   +6 more
doaj   +1 more source

Dynamic locomotor capabilities revealed by early dinosaur trackmakers from southern Africa. [PDF]

PLoS ONE, 2009
BACKGROUND: A new investigation of the sedimentology and ichnology of the Early Jurassic Moyeni tracksite in Lesotho, southern Africa has yielded new insights into the behavior and locomotor dynamics of early dinosaurs.
Jeffrey A Wilson, Claudia A Marsicano, Roger M H Smith   +2 more
doaj   +1 more source

New craniodental materials of Falcarius utahensis (Theropoda: Therizinosauria) reveal patterns of intraspecific variation and cranial evolution in early coelurosaurians

The Anatomical Record, EarlyView.
Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley   +1 more source

The first dinosaur from Washington State and a review of Pacific coast dinosaurs from North America.

PLoS ONE, 2015
We describe the first diagnostic dinosaur fossil from Washington State. The specimen, which consists of a proximal left femur, was recovered from the shallow marine rocks of the Upper Cretaceous (Campanian) Cedar District Formation (Nanaimo Group) and is
Brandon R Peecook, Christian A Sidor
doaj   +1 more source