Avian flight evolved higher in the avialan tree than commonly assumed.
The last two decades have seen a remarkable increase in the known diversity of basal avialans and their paravian relatives. The lack of resolution in the relationships of these groups combined with attributing the behavior of specialized taxa to the …
Theropods form a taxonomically and morphologically diverse group of dinosaurs that include extant birds. Inferred relationships between theropod clades are complex and have changed dramatically over the past thirty years with the emergence of …
A new chasmosaurine ceratopsid, *Medusaceratops lokii*, is described based on material collected from a bonebed in the Judith River Formation (Campanian) near Havre, Montana. Originally, all ceratopsid material from the bonebed was referred to the …
A new specimen of *Supersaurus vivianae* is described, providing additional information about the osteology of *Supersaurus*. The single *Supersaurus* individual that the WDC quarry produced allows a reexamination of elements referred to …
We describe the tenth skeletal specimen of the Upper Jurassic Archaeopterygidae. The almost complete and well-preserved skeleton is assigned to *Archaeopteryx siemensii* Dames, 1897 and provides significant new information on the osteology of the …
Breaking the false ground-up/trees-down dichotomy