What is a plethosaur?

Answer 1

A plethosaur is a type of prehistoric marine reptile belonging to the group of Plesiosauria, which existed during the Mesozoic era. Characterized by its long neck, small head, and large body with flippers, it was well-adapted for life in the ocean. Plesiosaurs, including plethosaurs, were known for their unique body structure, which allowed them to swim efficiently in aquatic environments. The term "plethosaur" is not commonly used and may often refer to specific genera or species within the broader plesiosaur category.