Elasmosaurus

Last time was Kronosaurus and now is Elasmosaurus.  They are both swimmers.  Elasmosaurus had a long neck and was like a sea Apatosaurus.  He was 46 feet long.  Elasmosaurus ate fish and had sharp teeth.  He weighed 2 tons - not nearly as much as Kronosaurus because more than half of his body length was neck.  He also has to go up to the surface of the water to breathe like modern sea mammals.

Here is a link to a video showing an Elasmosaurus from Prehistoric: Los Angeles. Prehistoric is one of my favorite shows.