Kronosaurus was a pliosaur, a group of marine reptiles also known as “short-necked plesiosaurs”. This was to separate them from other plesiosaurs, such as Elasmosaurus, known for their long necks and smaller heads.
Kronosaurus had a large head with powerful jaws full of sharp teeth, a short tail, and four paddle-like flippers to aid in swimming through the ocean. Its massive head alone was nearly 10 feet in length. It is the largest known pliosaur ever discovered.
Length: 11 meters (36 feet)
Weight: 12.1 metric tons (13.3 short tons)