Archosauromorph extinction selectivity during the Triassic–Jurassic mass extinction

  title={Archosauromorph extinction selectivity during the Triassic–Jurassic mass extinction},
  author={Bethany J. Allen and Thomas L. Stubbs and Michael J. Benton and Mark N. Puttick},
Many traits have been linked to extinction risk among modern vertebrates, including mode of life and body size. However, previous work has indicated there is little evidence that body size, or any other trait, was selective during past mass extinctions. Here, we investigate the impact of the Triassic–Jurassic mass extinction on early Archosauromorpha (basal dinosaurs, crocodylomorphs and their relatives) by focusing on body size and other life history traits. We built several new… 

Body Size Evolution in Crocodylians and Their Extinct Relatives

Crocodylians are currently facing evolutionary decline. This is evinced by the rich fossil record of their extinct relatives, crocodylomorphs, which show not only significantly higher levels of

Body Size Disparity of the Archosauromorph Reptiles during the First 90 Million Years of Their Evolution

It was found that the disparity of body size of archosauromorphs increased after the Permian/Triassic boundary and the relationship between this parameter and the palaeolatitudinal distribution of species.

The complex effects of mass extinctions on morphological disparity

It is found that morphological change over mass extinction is best studied by quantifying multiple aspects of morphospace occupation, and support for phylogenetic comparative methods away from the simulated Brownian motion toward Ornstein‐Uhlenbeck and Early Burst models is found.

A two-phase end-Triassic mass extinction

The multi-peak adaptive landscape of crocodylomorph body size evolution

Shifts between macroevolutionary regimes provide a better explanation of crocodylomorph body size evolution than do climatic factors, suggesting a central role for lineage-specific adaptations rather than climatic forcing.

Niche partitioning shaped herbivore macroevolution through the early Mesozoic

This work identifies five main herbivore guilds (ingestion generalists, prehension specialists, durophagous specialists, shearing pulpers, and heavy oral processors), and finds that herbivor clades generally avoided competition by almost exclusively occupying different guilds.

The early diversification of ray-finned fishes (Actinopterygii): hypotheses, challenges and future prospects.

Actinopterygii makes up half of living vertebrate diversity, and study of fossil members during their Palaeozoic rise to dominance has a long history of descriptive work. Although research interest

How to date a crocodile: estimation of neosuchian clade ages and a comparison of four time‐scaling methods

A detailed understanding of phylogenetic relationships, tree reconstruction methods, and good taxonomic coverage (in particular the inclusion of the oldest taxon in each clade) is essential when evaluating the results of such dating analyses.

Environmental drivers of body size evolution in crocodile-line archosaurs

It is confirmed that environmental factors played a significant role in the evolution of crocodiles and that body size evolution follows a punctuated, variable rate model of evolution, consistent with environmental drivers of evolution.

Selectivity and the effect of mass extinctions on disparity and functional ecology

Investigation of extinction selectivity and changes in taxonomic diversity, morphological disparity, and functional ecology over the ~160-million-year evolutionary history of diplobathrid crinoids, which spans two mass extinctions finds no evidence for selectivity.



Body length of bony fishes was not a selective factor during the biggest mass extinction of all time

The evolution of non-teleostean Actinopterygii (bony fishes) from the Devonian to the present day is explored, and the phylogenetic signal of extinction increases across the mass extinction boundary: extinction of species in the earliest Triassic is more clustered across phylogeny compared to the more randomly distributed extinction signal in the late Permian.

Ecomorphological selectivity among marine teleost fishes during the end-Cretaceous extinction

  • M. Friedman
  • Environmental Science, Geography
    Proceedings of the National Academy of Sciences
  • 2009
Ecomorphological selectivity among marine teleost fishes during the end-Cretaceous extinction is demonstrated, based on a genus-level dataset that accounts for lineages predicted on the basis of phylogeny but not yet sampled in the fossil record.

Phylogenetic Conservatism of Extinctions in Marine Bivalves

When analyzed using a standardized taxonomy within a phylogenetic framework, extinction rates of marine bivalves estimated from the fossil record for the last ~200 million years show conservatism at multiple levels of evolutionary divergence, both within individual families and among related families.

Phylogenetic Clustering of Origination and Extinction across the Late Ordovician Mass Extinction

Testing whether there was phylogenetic selectivity in extinction and origination using brachiopod genera from the Middle Ordovician through the Devonian finds that both extinctions and originations shift from taxonomically random or weakly clustered within families in theOrdovician to strongly clustered in the Silurian and Devonian.

End-Triassic nonmarine biotic events

Body size evolution during the Triassic archosauriform radiation

Abstract The first large (>1 m) diapsids appeared near the Permian–Triassic extinction and a subset of diapsids, the archosauriforms, expanded their body size range soon after in the Early–Middle

Selectivity of extinction among sea urchins at the end of the Cretaceous period

A global analysis of a major marine invertebrate group, the sea urchins, indicates that nutrient supply was a crucial factor in driving K/T-boundary extinctions, with selection more strongly focused on benthic adult than on larval planktotrophic stages.

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 higher-level phylogeny of Archosauria (Tetrapoda: Diapsida)

This analysis produces a well-resolved phylogeny, which recovers mostly traditional relationships within Avemetatarsalia, places Phytosauria as a basal crurotarsan clade, finds a close relationship between Aetosaurian and Crocodylomorpha, and recovers a monophyletic Rauisuchia comprised of two major subclades.

Body-size reduction in vertebrates following the end-Devonian mass extinction

Small, fast-breeding ray-finned fishes, sharks, and tetrapods, most under 1 meter in length from snout to tail, radiated to dominate postextinction ecosystems and vertebrae biodiversity, and the recovery interval resembled modern ecological successions in terms of active selection on size and related life histories.