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 …

For 130 years, dinosaurs have been divided into two distinct clades—Ornithischia and
Saurischia. Here we present a hypothesis for the phylogenetic relationships of the major …

Dinosauromorpha includes dinosaurs and other much less diverse dinosaur precursors of
Triassic age, such as lagerpetids [1]. Joint occurrences of these taxa with dinosaurs are rare …

Lagerpeton chanarensis is an early avemetatarsalian from the lower Carnian (lowermost
Upper Triassic) levels of the Chañares Formation, La Rioja Province, Argentina. Lagerpeton …

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 have been major components of ecosystems for over 200 million years. Although
different macroevolutionary scenarios exist to explain the Triassic origin and subsequent …

Resolving the evolutionary relationships of early diverging ('basal') ornithischian dinosaurs
is a challenging topic in palaeontology, with multiple competing hypotheses on the …

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

Research this century has greatly improved our knowledge of the origin and early radiation
of dinosaurs. The unearthing of several new dinosaurs and close outgroups from T riassic …