Global taxonomic diversity of anomodonts (tetrapoda, therapsida) and the terrestrial rock record across the Permian-Triassic boundary

PloS One
Jörg Fröbisch

Abstract

The end-Permian biotic crisis (~252.5 Ma) represents the most severe extinction event in Earth's history. This paper investigates diversity patterns in Anomodontia, an extinct group of therapsid synapsids ('mammal-like reptiles'), through time and in particular across this event. As herbivores and the dominant terrestrial tetrapods of their time, anomodonts play a central role in assessing the impact of the end-Permian extinction on terrestrial ecosystems. Taxonomic diversity analysis reveals that anomodonts experienced three distinct phases of diversification interrupted by the same number of extinctions, i.e. an end-Guadalupian, an end-Permian, and a mid-Triassic extinction. A positive correlation between the number of taxa and the number of formations per time interval shows that anomodont diversity is biased by the Permian-Triassic terrestrial rock record. Normalized diversity curves indicate that anomodont richness continuously declines from the Middle Permian to the Late Triassic, but also reveals all three extinction events. Taxonomic rates (origination and extinction) indicate that the end-Guadalupian and end-Permian extinctions were driven by increased rates of extinction as well as low origination rates. However, this...Continue Reading

References

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Citations

Sep 5, 2014·Proceedings. Biological Sciences·Kenneth D Angielczyk, L Schmitz
Jul 31, 2009·Proceedings. Biological Sciences·Jörg Fröbisch, Robert R Reisz
Oct 29, 2010·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Michael J Benton
Oct 28, 2011·Proceedings. Biological Sciences·Randall B Irmis, Jessica H Whiteside
Mar 22, 2014·PloS One·Torsten M ScheyerHugo Bucher
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Nov 1, 2019·Journal of Anatomy·Daniel de Simão-OliveiraFelipe L Pinheiro

Related Concepts

Fossils
Vertebrates
Sediments, Marine
Biodiversity
Kidney Failure, Chronic
Reptiles
End
Patterns
Herbivory
M-End

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