Polycotylidae is a family of plesiosaurs from the Cretaceous, a sister group to the elasmosauridae.With their short necks and large elongated heads, they resemble the pliosaurs, but closer phylogenetical studies indicate that they share many common features with the plesiosauridae and elasmosauridae.... plesiosaur
Plesiosaur
Plesiosaurs were carnivore aquatic reptiles. After their discovery, they were somewhat fancifully said to have resembled , although they had no shell.... from the Late Cretaceous
Late Cretaceous
Late Cretaceous refers to the second half of the Cretaceous Period , named after the famous white chalk cliffs of southern England, which date from this time.... of Argentina
Argentina
Argentina, officially the Argentine Republic , is a country in South America, constituted as a federation of 23 provinces and an autonomous city.... .
