Hemipristis serra

Hemipristis serra
Description de cette image, également commentée ci-après
Dents d'Hemipristis serra.
Classification
Règne Animalia
Embranchement Chordata
Sous-embr. Vertebrata
Classe Chondrichthyes
Sous-classe Elasmobranchii
Super-ordre Euselachii
Ordre Carcharhiniformes
Famille Hemigaleidae
Genre Hemipristis

Espèce

† Hemipristis serra
Agassiz, 1843

Hemipristis serra est une espèce éteinte de requins appartenant au genre Hemipristis[1] ayant vécu durant l'ère Cénozoïque, il y a 55,8 à 0,3 millions d'années. Ce requin devrait mesurer 7 mètres de long et malgré sa taille il vivait probablement dans des eaux peu profondes où il chassait des dugongs du genre Metaxytherium. L'espèce actuelle correspondante ou affine est le Milandre chicor (Hemipristis elongata).

Description et découverte

Dent fossilisée d'Hemipristis serra.

L'espèce a été décrite en 1843 par Louis Agassiz, la même année où il décrivit Ptychodus mortoni, Otodus, Isurus hastalis et enfin Carcharodon megalodon. Les dents d'Hemipristis serra semblent être très petites (taille d'une pièce de monnaie). Mais lorsqu'on les compare avec celles de l'actuel Hemipristis elongata, elles apparaissent largement plus grandes , ce qui a permis d'avoir une estimation de 7 mètres.

Ces restes fossilisés sont présents dans les faluns de Bretagne[2]. La forme des dents est très variable selon leur position dans ka mâchoire : supérieures habituellement larges, inférieures étroites.

Les dents inhabituelles de Hemipristis serra sont très prisées par les collectionneurs car elles se trouvent aussi souvent dans les sédiments du sud de la Floride qui donnent des dents de requins fossiles extrêmement colorées. Leurs dentelures exceptionnellement grandes en font un fossile de collection.

Voir aussi

Liens externes

Bibliographie

  • Louis Agassiz. 1843. Recherches Sur Les Poissons Fossiles. Tome III (livr. 15-16). Imprimerie de Petitpierre, Neuchatel 157-390
  • E. D. Cope. 1868. Extinct Cetacea from the Miocene bed of Maryland. Proceedings of the Academy of Natural Sciences Philadelphia 20(3):159-160
  • A. S. Woodward. 1889. Catalogue of the Fossil Fishes in the British Museum (Natural History) Part 1 1-613
  • M. Leriche. 1942. Contribution a l'etude des faunes ichthyologiques marines des terrains tertiaires de la plaine cotiere Atlantique et du centre des Etats-Unis. Memoires de la Societe Geologique de France (Nouvelle Serie) 45:1-111
  • P. E. P. Deraniyagala. 1969. A Miocene vertebrate faunule from the Malu member of Ceylon. Spolia Zeylanica 31(II):1-17
  • D. S. Vicens and A. Rodríguez-Perea. 2003. Vertebrats fossils (Pisces i Reptilia) del Burdigalia de cala Sant Vicenc (Pollenca, Mallorca). Boll. Soco Hist. Nat. Balears 46:117-130
  • S. Adnet, P.-O. Antoine, S.R. Hassan Baqri, J.-Y. Crochet, L. Marivaux, J.-L. Welcomme, et G. Métais. 2007. New tropical carcharhinids (chondrichthyes, Carcharhiniformes) from the late Eocene–early Oligocene of Balochistan, Pakistan: Paleoenvironmental and paleogeographic implications. Journal of Asian Earth Sciences 30(2):303-323
  • D. J. Cicimurri and J. L. Knight. 2009. Late Oligocene sharks and rays from the Chandler Bridge Formation, Dorchester County, South Carolina, USA. Acta Palaeontologica Polonica
  • Jean-Marie Canevet. 2016. Les Sélaciens de la transition Miocène-Pliocène de Gourbesville (Manche ; France) : premier signalement de dents fossiles de Carcharodon carcharias [3]

Sources

  • Fossiles, revue, n°30, 2017. Les fossiles oligocènes-miocènes des environs de Rennes.

Notes et références

  1. ↑ D. J. Cicimurri and J. L. Knight. 2009. Late Oligocene sharks and rays from the Chandler Bridge Formation, Dorchester County, South Carolina, USA. Acta Palaeontologica Polonica
  2. ↑ Calcaire du Quiou, Falun de Saint-Grégoire et Falun de Chartres-de-Bretagne.

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