Post-Ordovician trilobite diversity and evolutionary faunas

Bault, Valentin; Balseiro, Diego; Monnet, Claude; Crônier, Catherine

Document type :

Compte-rendu et recension critique d'ouvrage

DOI :

10.1016/j.earscirev.2022.104035

Title :

Post-Ordovician trilobite diversity and evolutionary faunas

Author(s) :

Bault, Valentin [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Balseiro, Diego [Auteur]
Universidad Nacional de Córdoba [Argentina]
Monnet, Claude [Auteur]

Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Crônier, Catherine [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]

Journal title :

Earth-Science Reviews

Pages :

104035

Publisher :

Elsevier

Publication date :

2022

ISSN :

0012-8252

English keyword(s) :

Trilobites
Palaeozoic
Evolutionary faunas
Palaeobiodiversity
Extinction
Environmental events

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Paléontologie

English abstract : [en]

Trilobites were the most successful clade of marine invertebrates during the Cambrian, as highlighted by Sepkoski's Cambrian Evolutionary Fauna. After the Cambrian they were still abundant, widespread and highly diversified. ...
Show more >Trilobites were the most successful clade of marine invertebrates during the Cambrian, as highlighted by Sepkoski's Cambrian Evolutionary Fauna. After the Cambrian they were still abundant, widespread and highly diversified. Previous analyses show that trilobite diversity dynamics during the Ordovician can be summarized by several trilobite evolutionary faunas. Trilobites, however, were severely affected by the end-Ordovician extinction event, and never again reached such a high diversity. Here we investigate the evolutionary history of trilobites after this crisis by evaluating how their diversity dynamics are structured in evolutionary faunas and what could be the environments influencing these faunas. Using occurrences from the Paleobiology Database, we estimate the post-Ordovician palaeobiodiversity of trilobites by coverage rarefaction (SQS) and identify trilobite evolutionary faunas by means of factor analysis. During the Silurian, trilobite taxonomic richness was relatively high and the Silurian Fauna was dominated by the families that appeared in the Ordovician and survived the end-Ordovician extinction, such as Odontopleuridae and Encrinuridae. A Devonian Fauna established progressively since the end of the Silurian as other families diversified, such as Acastidae and Tropidocoryphidae. The Early Devonian records the highest post-Ordovician diversity, probably favoured by the spreading of epicontinental shallow seas. Abrupt sea-level changes and anoxic events during the Middle Devonian strongly reduced trilobite diversity and brought both Silurian and Devonian Faunas close to their disappearance. During the Late Devonian, trilobite diversity was low and dominated by phacopids and proetids, which characterize a Kellwasser Fauna. Finally, the Hangenberg event (end-Devonian) affected all existing trilobite clades and the following Tournaisian diversification led to the Late Palaeozoic Fauna, composed of phillipsiids and brachymetopids. Despite an important diversity decrease in the Visean–Serpukhovian, this fauna was the only one to persist until the extinction of trilobites at the end of the Permian.Show less >

Language :

Anglais

Popular science :

Non

Collections :

Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL

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