Whereas ornithischian dinosaurs are well known from Jurassic and Cretaceous deposits,
deciphering the origin and early evolution of the group remains one of the hardest …

The origin and evolutionary relationships of ornithischian dinosaurs are topics that have
undergone a series of substantial revisions. At present there are several competing …

A new discovery of skeletons of Revueltosaurus callenderi from the Upper Triassic Chinle
Formation of Petrified Forest National Park, Arizona clearly shows that Revueltosaurus is not …

Ornithischia is a familiar and diverse clade of dinosaurs whose global phylogeny has
remained largely unaltered since early cladistic analyses in the mid 1980s. Current …

Two recent studies have independently recovered Pisanosaurus mertii–long thought to
represent the oldest known member of Ornithischia–within Silesauridae. These finds are …

Although the group played an important role in the evolution of Late Mesozoic terrestrial
ecosystems, the early evolutionary history of the ornithischian dinosaurs remains poorly …

Ornithischian dinosaurs are one of the most taxonomically diverse dinosaur clades during
the Mesozoic, yet their origin and early diversification remain virtually unknown. In recent …

The early Mesozoic fossil fauna collected from the Lower Lufeng Formation of Yunnan
Province, China, has attracted considerable interest and attention since its discovery in the …

The enigmatic dinosaur taxon Chilesaurus diegosuarezi was originally described as a
tetanuran theropod, but this species possesses a highly unusual combination of features …

The ornithosuchids were a group of archosaurs with body lengths ranging from 2 to 4 m
recorded from Upper Triassic beds in Argentina and Scotland. The group was defined as a …