Reinterpretation of the enigmatic Ordovician genus Bolboporites (Echinodermata). - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Zoosymposia Année : 2019

Reinterpretation of the enigmatic Ordovician genus Bolboporites (Echinodermata).

Résumé

Bolboporites is an enigmatic Ordovician cone-shaped fossil, the precise nature and systematic affinities of which have been controversial over almost two centuries. For the first time, a wide range of techniques (CT-scan, SEM, cathodoluminescence, XPL, UV epifluorescence, EBSD, FT-IR and XRF spectrometry) were applied to wellpreserved specimens of Bolboporites from Norway and Russia. Our main finding confirms its echinoderm affinities, as shown by its stereomic microstructure and by the first definitive evidence of its monocrystalline nature. Each cone consists in a single, microporous calcitic crystal with a narrow longitudinal internal canal. These results are combined with all previous data on Bolboporites to critically discuss five alternative interpretations of this fossil, namely theca, basal cone, spine, columnal, and holdfast, respectively. The most parsimonious scenario considers Bolboporites as an isolated spine, which was articulated in life by a short biserial appendage to the body wall of an unknown echinoderm, possibly of echinozoan affinities.

Domaines

Paléontologie
Fichier principal
Vignette du fichier
Gillard et al. (2019) Zoosymposia (1).pdf (7.73 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02333918 , version 1 (13-11-2020)

Identifiants

Citer

Emeric Gillet, Bertrand Lefebvre, Véronique Gardien, Emilie Steimetz, Christophe Durlet, et al.. Reinterpretation of the enigmatic Ordovician genus Bolboporites (Echinodermata).. Zoosymposia, 2019, 15 (1), pp.44-70. ⟨10.11646/zoosymposia.15.1.7⟩. ⟨hal-02333918⟩
72 Consultations
54 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More