A late-surviving Triassic protomonaxonid sponge from the Paris Biota (Bear Lake County, Idaho, USA). - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Geobios Année : 2019

A late-surviving Triassic protomonaxonid sponge from the Paris Biota (Bear Lake County, Idaho, USA).

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

Résumé

Protomonaxonid sponges are a major group of Cambrian and Ordovician fossils in exceptionally preserved (especially Burgess Shale-type) faunas, but are rare thereafter. Rare examples of apparent surviving lineages are known from the late Palaeozoic and Mesozoic, but by this time more derived groups of sponges have generally displaced them in at least shallow-water (shelf depth) ecosystems. The early Spathian (Early Triassic) Paris Biota includes abundant material of a new leptomitid protomonaxonid, Pseudoleptomitus advenus Botting nov. gen., nov. sp., distinguished by having an unbundled longitudinal skeleton and very weak transverse component. This is the first post-Ordovician leptomitid known, and indicates long-term survival of the group in unknown environments. Its occurrence near storm wave base is similar to the preferred environment of earlier examples of the family, suggesting either ecological rarity or taphonomic reasons for their 200-million-year absence from later Palaeozoic rocks.

Domaines

Paléontologie
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Dates et versions

hal-02168369 , version 1 (28-06-2019)

Identifiants

Citer

Joseph P. Botting, Arnaud Brayard, Kevin G. Bylund, Gilles Escarguel, Emmanuel Fara, et al.. A late-surviving Triassic protomonaxonid sponge from the Paris Biota (Bear Lake County, Idaho, USA).. Geobios, 2019, 54, pp.5-11. ⟨10.1016/j.geobios.2019.04.006⟩. ⟨hal-02168369⟩
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