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 …

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 …

Homology—a similar trait shared by different species and derived from common ancestry,
such as a seal's fin and a bird's wing—is one of the most fundamental yet challenging …

Dinosaurs were remarkably successful during the Mesozoic and one subgroup, birds,
remain an important component of modern ecosystems. Although the extinction of non-avian …

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 …

The sequence of neurocentral suture closure is one criterion for the determination of
ontogenetic stage in extant crocodylians. This pattern is frequently used to assess ontogeny …

Abundant fossils of the terrestrial Jehol Biota, including plants, insects, dinosaurs, birds,
mammals and freshwater invertebrates, were discovered from the Yixian Formation and the …

Tyrannosaurs, the group of dinosaurian carnivores that includes Tyrannosaurus rex and its
closest relatives, are icons of prehistory. They are also the most intensively studied extinct …

Birds are unique among living vertebrates in possessing pneumaticity of the postcranial
skeleton, with invasion of bone by the pulmonary air-sac system,,,. The avian respiratory …

Tyrannosauroids—the group of carnivores including Tyrannosaurs rex—are some of the
most familiar dinosaurs of all. A surge of recent discoveries has helped clarify some aspects …