Morphology forms the most fundamental level of data in vertebrate palaeontology because it
is through interpretations of morphology that taxa are identified, creating the basis for broad …

Background The origin of birds is one of the most enduring and dramatic evolutionary
debates. The hypothesis that the primarily small-sized birds are nested within a theropod …

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 …

The early evolution of the major groups of derived non-avialan theropods is still not well
understood, mainly because of their poor fossil record in the Jurassic. A well-known result of …

Archaeopteryx is widely accepted as being the most basal bird, and accordingly it is
regarded as central to understanding avialan origins; however, recent discoveries of derived …

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 …

El Grupo Neuquén conforma una sucesión de depósitos continentales de origen fluvial,
eólico y lacustre somero, desarrollado en la Cuenca Neuquina entre el Cenomaniano …

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 …

The recent discovery of small paravian theropod dinosaurs with well-preserved feathers in
the Middle–Late Jurassic Tiaojishan Formation of Liaoning Province (northeastern China) …

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 …