Patagonia has yielded the most comprehensive fossil record of Cretaceous theropods from
Gondwana, consisting of 31 nominal species belonging to singleton taxa and six families …

Coelurosauria is the most diverse clade of theropod dinosaurs. Much of this diversity is
present in Paraves—the clade of dinosaurs containing dromaeosaurids, troodontids, and …

Archosaurs have a 250 million year record that originated shortly after the Permian-Triassic
extinction event and is continued today by two extant clades, the crocodylians and the …

Uncertainties in the phylogeny of birds (Avialae) and their closest relatives have impeded
deeper understanding of early theropod flight. To help address this, we produced an …

ABSTRACT A detailed osteological description of Tyrannosaurus rex Osborn, 1905 is
presented, based primarily on the most complete specimen yet collected of this taxon …

Progress on the evolutionary origin and diversification of feathers has been hampered by
conceptual problems and by the lack of plesiomorphic feather fossils. Recently, both of these …

Isolated theropod teeth are some of the most common fossils in the dinosaur fossil record
and are continually reported in the literature. Recently developed quantitative methods have …

Abstract Charles Darwin commented that Ichthyornis, as one of the “toothed birds” from the
Late Cretaceous of Kansas, offered some of “the best support to the theory of evolution”(in …

The braincase region of tyrannosaurs was investigated to provide insights on anatomical
attributes relevant to inferences of sensory biology and behavior. CT scanning focused on …

This work serves as a compendium of anatomical resources upon which a companion
phylogenetic analysis of Aves and related Theropoda (Avialae) was based. Following a brief …