un cachalot préhistorique

Le Brygmophyseter Shigensis appartint à la famille des Physeteridaes qui comprend tout les cachalots actuels;et le sous ordre des Odontocètes(cétaceas  dents) comprenant cachalots,dauphins et apparentés.

Cet animal mesurait entre 7 et 12 mètres de longs avec un crâne de 140 cm.A la différence des cachalots actuels,le Brygmophyseter possédait des dents sur l machoire supérieure.Ses dents et ses machoires sont plus massives que celles des espèces modernes.

Le Brygmophyseter se déplaçait probablement en groupes il y a 15 ma dans l'océan Pacifique,précisément au Japon.

C'était un superprédateur,certainement rival du gigantesque requin Megaselachus Megalodon.Ces pincipales proies étaient des gros poissons,des calamars géants,d'autres cétacés et peut être des pinnipèdes(otaries,phoques) comme l'Orque actuelle.

Il s'est probablement éteint supplanté par de nouveaux carnivores plus efficaces comme l'Orque.

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