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 …

The ascendancy of dinosaurs on land near the close of the Triassic now appears to have
been as accidental and opportunistic as their demise and replacement by therian mammals …

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 …

Following our traditional concept of Mammalia, and thus including a number of forms known
only by fossils of the Mesozoic, the earliest mammals are from the Late Triassic, a bit over …

The most commonly cited apomorphy of Archosauriformes is an opening in the snout known
as the antorbital cavity. Despite the ubiquity and prominence of the antorbital cavity, its …

ABSTRACT A detailed osteological description of Tyrannosaurus rex Osborn, 1905 is
presented, based primarily on the most complete specimen yet collected of this taxon …

Long wishes to especially thank Samuel P. Welles for his friendship and guidance, and for
introducing him to the joys of Triassic vertebrates. William Berry, former director of the …

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 …

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