Researchers believe the creature belongs to the genus Aristonectes, which was considered an outlier to other elasmosaurs because they have shorter necks and a larger skull.
Elasmosaurs had long necks, snake-like heads and four flippers
It took decades for researchers to recover the 70-million-year-old remains of the elasmosaur, which would have weighed as much as 15 tons.
This 40-ft long elasmosaur - found on a small, desolate island off Antarctica - is believed to be the heaviest of its kind, and it is one of the most complete ancient reptile fossils ever discovered on the southernmost continent.
In comparison to other plesiosaur teeth, these specimens are most similar to the teeth of elasmosaurs: they have a smooth outer surface and crenulated inner surface, with crenulations that extend nearly to the tip of the tooth.
Two fossil adult elasmosaurs (NZGS CD425 and NZGS CD442) from New Zealand have been described as having teeth 35-40 mm long above the alveoli (Wiffen and Moisley, 1986).
Comparativement aux autres dents de plesiosaures, ces specimens ressemblent beaucoup aux dents d'elasmosaures: leur surface exterieure est lisse et leur surface interieure est crenelee, les crenulations s'etendant presque jusqu'a la pointe de la dent.
Mots cles: Cretace superieur, ile Axel Heiberg, elasmosaures, paleoclimat, paleoenvironnement