Note sur le dernier enregistrement connu d’une graine cupuliforme du terrain houiller du Pennsylvanien moyen de Sydney, en Nouvelle-Écosse, au Canada
DOI :
https://doi.org/10.4138/atlgeol.2021.011Résumé
La seule graine cupuliforme de lyginopteridée connue recueillie du terrain houiller du Pennsylvanien moyen de Sydney, en Nouvelle-Écosse, au Canada, est constituée d’une cupule carbonifiée entourant une structure ovée d’une taille de 3 mm sur 2 qui est interprétée comme un ovule. L’ovule est blanc, couleur témoignant de son mode de conservation calcitique, et il est dépourvu de fragments cellulaires. Comme le spécimen est incomplet, une détermination taxonomique détaillée n’est pas possible, mais ses affinités se manifestent dans les ptéridospermes des lyginopteridées (ou hydraspermans). Cette découverte importante d’un ptéridosperme de lyginopteridée enrichit les signalements antérieurs de ptéridospermes médullosés de la flore du terrain houiller de Sydney.
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