Birds are one of the most recognizable and diverse groups of modern vertebrates. Over the
past two decades, a wealth of new fossil discoveries and phylogenetic and …

The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks
(approximately 230 Ma) accumulated over extensional rift basins in southwestern Pangea …

The early evolution of archosauromorphs during the Permo-Triassic constitutes an excellent
empirical case study to shed light on evolutionary radiations in deep time and the timing and …

Archosaurs have a 250 million year record that originated shortly after the Permian-Triassic
extinction event and is continued today by two extant clades, the crocodylians and the …

Dating the tree of life is a core endeavor in evolutionary biology. Rates of evolution are
fundamental to nearly every evolutionary model and process. Rates need dates. There is …

The relationship between dinosaurs and other reptiles is well established,,,, but the
sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils …

The Triassic period documents the origin and diversification of modern amniote lineages
and the Late Triassic fossil record of South America has been crucial to shed light on these …

Triassic beds from Argentina and Brazil provide the most relevant fossil record of early
dinosauriforms in terms of numerical abundance and taxonomic diversity. This record …

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

There are few putative macroevolutionary trends or rules that withstand scrutiny. Here, we
test and verify the purported tendency for animal clades to reach their maximum …