GEOSCAN, résultats de la recherche


TitreSynchrotron-aided reconstruction of the conodont feeding apparatus and implications for the mouth of the first vertebrates
AuteurGoudemand, N; Orchard, M J; Urdy, S; Bucher, H; Tafforeau, P
SourceProceedings of the National Academy of Sciences of the United States of America; Proceedings of the National Academy of Sciences of the United States of America vol. 108, no. 21, 2011 p. 8720-8724, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100528
Documentpublication en série
Mediapapier; en ligne; numérique
Sujetsfossiles; distribution de fossiles; morphologie des fossiles; descriptions des fossiles; Trias inférieur; paléontologie; Mésozoïque; Trias
Illustrationsphotographs; models
Programmebassins sédimentaires du Yukon, GEM : La géocartographie de l'énergie et des minéraux
Diffusé2011 05 09
Résumé(disponible en anglais seulement)
The origin of jaws remains largely an enigma that is best addressed by studying fossil and living jawless vertebrates. Conodonts were eel-shaped jawless animals, whose vertebrate affinity is still disputed. The geometrical analysis of exceptional three-dimensionally preserved clusters of oro-pharyngeal elements of the Early Triassic Novispathodus, imaged using propagation phase-contrast X-ray synchrotron microtomography, suggests the presence of a pulley- shaped lingual cartilage similar to that of extant cyclostomes within the feeding apparatus of euconodonts ("true" conodonts). This would lend strong support to their interpretation as vertebrates and demonstrates that the presence of such cartilage is a plesiomorphic condition of crown vertebrates.