The Ectenosaurus is a small, pretty fat mosasaur. It's one of the weakest and one of the smallest sea predators, being a little bigger than the Classic Coelcanth. It's back is grey and it's belly is white, it is really blocky for the time of it's realease and for the Dinosaur Simulator model standards of today even though it is well animated desptie it's blockyness.
It lived in Texas and Kansas, in the Cretaceous 86-83 MYA.
It is rarely used, as it is VERY blocky, and weak.