Deep faunistic turnovers preceded the rise of dinosaurs in southwestern Pangaea

  title={Deep faunistic turnovers preceded the rise of dinosaurs in southwestern Pangaea},
  author={Mart{\'i}n d. Ezcurra and Lucas E. Fiorelli and Agustín G. Martinelli and Sebasti{\'a}n Rocher and M. Bel{\'e}n Von Baczko and Miguel Ezpeleta and Jerem{\'i}as R. A. Taborda and E. Mart{\'i}n Hechenleitner and M. Jimena Trotteyn and Julia Brenda Desojo},
  journal={Nature Ecology \& Evolution},
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 early evolutionary histories. However, the faunistic changes that led to the establishment of Late Triassic ecosystems are largely ignored because of the global scarcity of fossils from assemblages a few million years older. Here we contribute to fill this gap with the description of a new tetrapod assemblage from… 
The Carnian Pluvial Episode and the origin of dinosaurs
We present new evidence for a major inflection point in the history of tetrapods on land, a jump in the diversification of archosauromorphs, primarily dinosaurs, at 232–230 Ma. This corresponds to a
A new faunistic component of the Lower Triassic Panchet Formation of India increases the continental non-archosauromorph neodiapsid record in the aftermath of the end-Permian mass extinction
The fossil record of Early Triassic diapsids is very important to understand how the end-Permian mass extinction affected ecosystems and the patterns and processes involved in the subsequent biotic
The stem-archosaur evolutionary radiation in South America
Abstract The oldest archosauromorphs (dinosaurs, birds, crocodiles, and their stem-taxa) are recorded in middle−upper Permian rocks, but it was not after the Permo−Triassic mass extinction that the
Dinosaur diversification linked with the Carnian Pluvial Episode
Palaeontological and dated stratigraphic evidence is synthesized to show that dinosaur diversification followed the Carnian Pluvial Episode 234–232 mya, a time when climates switched from arid to humid and back to arid again.
The paleoclimatic context for South American Triassic vertebrate evolution
Abstract The Triassic Period was the setting for the origin and early diversification of Mesozoic ecosystems after the end-Permian mass extinction. The study of the Triassic is essential to
Increases in sampling support the southern Gondwanan hypothesis for the origin of dinosaurs
Dinosaurs were ubiquitous in terrestrial ecosystems through most of the Mesozoic and are still diversely represented in the modern fauna in the form of birds. Recent efforts to better understand the
Evidence for the Carnian Pluvial Episode in Gondwana: New multiproxy climate records and their bearing on early dinosaur diversification
Abstract The Triassic hothouse world experienced dynamic changes in climate and ecosystems that set the Earth's climate and biotic states for much of the Mesozoic Era. A critical time interval was
Triassic faunal successions of the Paraná Basin, southern Brazil
Abstract The Parana Basin was filled by a sedimentary package deposited in successive sedimentation episodes related to the tectonic events that hit the SW portion of the Gondwana. The Triassic
Triassic sauropodomorph dinosaurs from South America: The origin and diversification of dinosaur dominated herbivorous faunas
Abstract Sauropodomorpha is the first major dinosaurian group that radiated during the Triassic. During this time the group underwent major changes in body plan, including the acquisition of features
Extinction and dawn of the modern world in the Carnian (Late Triassic)
A meta-analysis of fossil data suggests that the Carnian Pluvial Episode was linked to a major extinction event and might have been the trigger of the spectacular radiation of many key groups that dominate modern ecosystems.


The origin and early radiation of dinosaurs
Abstract Dinosaurs were remarkably successful during the Mesozoic and one subgroup, birds, remain an important component of modern ecosystems. Although the extinction of non-avian dinosaurs at the
The origin and early evolution of dinosaurs
The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks accumulated over extensional rift basins in southwestern Pangea, and the group achieved a nearly global distribution by the latest Triassic, especially with the radiation of saurischian groups such as “prosauropods” and coelophysoids.
A Short-Snouted, Middle Triassic Phytosaur and its Implications for the Morphological Evolution and Biogeography of Phytosauria
The exquisitely preserved, nearly complete skeleton of Diandongosuchus fuyuanensis from the Middle Triassic of China is recognized as the oldest and basalmost phytosaur, indicating that the characteristic elongated rostrum of phytosaurs appeared subsequent to cranial and postcranial modifications associated with enhanced prey capture, predating that general trend of morphological evolution observed within Crocodyliformes.
The Rosario do Sul Group is one of the better-known tetrapod-bearing continental deposits of Triassic age. It crops out in central Rio Grande do Sul, south Brazil, and has yielded a fauna of more
Studies on continental Late Triassic tetrapod biochronology. II. The Ischigualastian and a Carnian global correlation
The Ischigualastian represents a key land vertebrate faunachron for the correlation of Late Triassic terrestrial deposits worldwide, based on the abundant and diverse tetrapod fauna of the
Faunal replacement in the Triassic of South America
Improvements in the locomotor apparatus are discernible in seven groups of archosaurs and indicate that a great adaptive radiation took place before the oldest recorded fauna dominated by archosaurs appeared.
The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades
A time-calibrated phylogeny of Archosauriformes indicates that the origin and initial diversification of archosauria occurred during the Early Triassic following the Permian-Triassic extinction.
The precise temporal calibration of dinosaur origins
Using precise radioisotopic ages, it is demonstrated that the temporal gap between assemblages containing only dinosaur precursors and those with the first dinosaurs was 5–10 million years shorter than previously thought, suggesting that the origin of dinosaurs was a relatively rapid evolutionary event.
The rocks of Middle/Upper Triassic from Southern Brazil (Parana Basin) can be divided in three major and clearly distinct biostratigraphic units from the basis to the top: 1) Therapsid Cenozone,
Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira
The analysis suggests that the dentition and diet of silesaurids, ornithischians and sauropodomorphs evolved independently from a plesiomorphic carnivorous form, and Asilisaurus demonstrates the antiquity of both Ornithodira and the dinosaurian lineage.