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 …

Birds evolved from and are phylogenetically recognized as members of the theropod
dinosaurs; their first known member is the Late Jurassic Archaeopteryx, now represented by …

The bony palate diagnoses the two deepest clades of extant birds: Neognathae and
Palaeognathae,,,–. Neognaths exhibit unfused palate bones and generally kinetic skulls …

The most commonly cited apomorphy of Archosauriformes is an opening in the snout known
as the antorbital cavity. Despite the ubiquity and prominence of the antorbital cavity, its …

Until relatively recently, information on the internal skull structures of fossil taxa relied on
fortuitous breaks, aggressive removal of rock matrix (Galton 1989, 2001), sectioning with a …

Recent fieldwork in the Upper Cretaceous (Maastrichtian) Maevarano Formation, northwest
Madagascar, has yielded important new skull material of the abelisaurid theropod …

Fossil evidence for changes in dinosaurs near the lineage leading to birds and the origin of
flight has been sparse. A dinosaur from Mongolia represents the basal divergence within …

ABSTRACT A study of ontogenetic variation is used to clarify aspects of tyrannosaurid
taxonomy and investigate the supposed phenomenon of dwarfism in the clade. A …

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 …