Results 21 to 30 of about 127 (63)

The Early Evolution of Rhynchosaurs [PDF]

open access: yes, 2016
The rhynchosaurian archosauromorphs are an important and diverse group of fossil tetrapods that first appeared during the Early Triassic and probably became extinct during the early Late Triassic (early Norian).
Butler, Richard J.   +2 more
core   +3 more sources

Sobreviventes: diversificação de Archosauromorpha após a Extinção Permo-Triássica [PDF]

open access: yes, 2020
: The Archosauromorpha is defined as the clade that comprises all diapsids more closely related to the lineage of birds (Ornithodira or Avemetatarsalia) and crocodylians (Pseudosuchia or Crurotarsi) than to Lepidosauria. In addition to their ‘basal’ taxa
Oliveira, Tiane Macedo de   +2 more
core   +2 more sources

New specimen and redescription of Anisodontosaurus greeri (Moenkopi Formation: Middle Triassic) and the spatiotemporal origins of Trilophosauridae [PDF]

open access: yes, 2022
Anisodontosaurus greeri is an enigmatic small-bodied tetrapod with a heterodont dentition from the Holbrook Member of the Moenkopi Formation (Middle Triassic) of Arizona (U.S.A.).
Butler, Richard J.   +4 more
core   +1 more source

Aquatic Habits and Niche Partitioning in the Extraordinarily Long-Necked Triassic Reptile Tanystropheus [PDF]

open access: yes, 2020
Tanystropheus longobardicus is one of the most remarkable and iconic Triassic reptiles. Mainly known from the Middle Triassic conservation Lagerstätte of Monte San Giorgio on the Swiss-Italian border, it is characterized by an extraordinarily long and ...
Aguilera   +68 more
core   +1 more source

Rapid Initial Morphospace Expansion and Delayed Morphological Disparity Peak in the First 100 Million Years of the Archosauromorph Evolutionary Radiation [PDF]

open access: yes, 2021
Adaptive radiations have played a major role in generating modern and deep-time biodiversity. The Triassic radiation of the Archosauromorpha was one of the most spectacular vertebrate radiations, giving rise to many highly ecomorphologically varied ...
Ezcurra, Martin Daniel   +2 more
core   +2 more sources

Heads or tails first? Evolution of fetal orientation in ichthyosaurs, with a scrutiny of the prevailing hypothesis [PDF]

open access: yes, 2023
According to a longstanding paradigm, aquatic amniotes, including the Mesozoic marine reptile group Ichthyopterygia, give birth tail-first because head-first birth leads to increased asphyxiation risk of the fetus in the aquatic environment.
Blackburn, Daniel G   +6 more
core   +1 more source

Unique internal anatomy of vertebrae as a key factor for neck elongation in Triassic archosauromorphs [PDF]

open access: yes
The Triassic was a key period in the evolution of vertebrates, and reptiles in particular, giving rise to a plethora of successful lineages, some of which are still extant. One of the groups that flourished during the early Mesozoic were the tanysaurians
Rytel, Adam   +6 more
core   +4 more sources

A REEXAMINATION OF FOUR PROLACERTIFORMS WITH IMPLICATIONS FOR PTEROSAUR PHYLOGENESIS [PDF]

open access: yes, 2000
Traditionally, pterosaurs have been included within the Archosauriformes and many contemporary workers consider the Pterosauria the sister group to Lagosuchus, Scleromochlus and the Dinosauria.
PETERS, DAVID
core   +3 more sources

Anatomy, paleobiology and phylogenesis of Macrocnemus bassanii Nopcsa 1930 (Reptilia, Protorosauria) [PDF]

open access: yes, 2016
Macrocnemus bassanii è un rettile diapside del Triassico medio appartenente al gruppo dei Protorosauria. Le sue principali caratteristiche sono gli arti posteriori molto più lunghi di quelli anteriori e il collo rigido e allungato.
Saller, Franco <1963>
core   +1 more source

Ontogenetic variation in the cranium of Mixosaurus cornalianus, with implications for the evolution of ichthyosaurian cranial development [PDF]

open access: yes, 2023
Relatively complete ontogenetic series are comparatively rare in the vertebrate fossil record. This can create biases in our understanding of morphology and evolution, since immaturity can represent a source of unrecognized intraspecific variation in ...
Bindellini, Gabriele   +4 more
core   +1 more source

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