New fossil triakid sharks from the early Eocene of Premontre, France, and comments on fossil record of the family - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Palaeontologica Polonica Année : 2008

New fossil triakid sharks from the early Eocene of Premontre, France, and comments on fossil record of the family

Résumé

During the last two decades, an abundant selachian assemblage has been collected from the late Ypresian (NP12) fossiliferous sands of Premontre (Aisne, northern France) but has received little attention. Sharks of the family Triakidae (Carcharhiniformes) are particularly well represented and all are described and figured herein. Among them, two new species of the genus Galeorhinus are described: G. duchaussoisi sp. nov. and G. louisi sp. nov.; these are compared to the common Paleogene G. ypresiensis which is refigured. Another triakid taxon, the genus Gomphogaleus gen. nov., is described. Most of the triakids have been recorded elsewhere in the North Atlantic region, suggesting a wider distribution than expected for these small sharks during the Paleogene. The present paper updates the list of selachians from Premontre, bringing the number of taxa from 19 to 33 (including 22 sharks and 11 batoids) and improving our knowledge of the ancient North Atlantic Ypresian selachian fauna. Despite this vastly improved record, it is clear that fossil data are still very incomplete and insufficient for calibrating phylogenetic hypotheses of living forms. Review of the Premontre fauna shows that the Triakidae were much more diverse and broadly distributed than at present, suggesting that the limited distribution and low diversity of living forms is probably a recent phenomenon.
Fichier principal
Vignette du fichier
app53-433.pdf (805.49 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

halsde-00454629 , version 1 (06-01-2022)

Licence

Paternité

Identifiants

Citer

Sylvain Adnet, Henri Cappetta. New fossil triakid sharks from the early Eocene of Premontre, France, and comments on fossil record of the family. Acta Palaeontologica Polonica, 2008, 53 (3), pp.433-448. ⟨10.4202/app.2008.0306⟩. ⟨halsde-00454629⟩
87 Consultations
62 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More