A new holocrinid (Articulata) from the Paris Biota (Bear Lake County, Idaho, USA) highlights the high diversity of Early Triassic crinoids. - Université Claude Bernard Lyon 1 Accéder directement au contenu
Article Dans Une Revue Geobios Année : 2019

A new holocrinid (Articulata) from the Paris Biota (Bear Lake County, Idaho, USA) highlights the high diversity of Early Triassic crinoids.

Emmanuelle Vennin
Emmanuel Fara
  • Fonction : Auteur
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Nicolas Olivier
Arnaud Brayard
Kevin G. Bylund
  • Fonction : Auteur
James F. Jenks
  • Fonction : Auteur

Résumé

After the end-Permian crisis and the extinction of their four Paleozoic subclasses, crinoids rapidly recovered. This group is classically believed to have radiated from a small surviving clade and to have diversified during the Middle and Upper Triassic from two lineages. Nevertheless, recent findings suggested that several lineages of crinoids had already diversified during the Early Triassic, and that their diversity has been overlooked. Here we describe a new form of holocrinid, Holocrinus nov. sp., from the earliest Spathian (Early Triassic) of southeastern Idaho (USA). So far, the exceptional completeness of sampled specimens, with skeletal elements of arms and stem in connection, is unique for the Early Triassic. They show that derived morphological features had already evolved ∼1.3 million years after the Permian–Triassic boundary, supporting the scenario of a rapid Early Triassic diversification of crinoids.

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Paléontologie
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hal-02168450 , version 1 (25-10-2021)

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Paternité - Pas d'utilisation commerciale

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Thomas Saucède, Emmanuelle Vennin, Emmanuel Fara, Nicolas Olivier, Arnaud Brayard, et al.. A new holocrinid (Articulata) from the Paris Biota (Bear Lake County, Idaho, USA) highlights the high diversity of Early Triassic crinoids.. Geobios, 2019, 54, pp.45-53. ⟨10.1016/j.geobios.2019.04.003⟩. ⟨hal-02168450⟩
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