The Largest Marine Iguana ever to live it lived from 60 to 8 Million years ago in what is Today South America and South Panama they were omnivorous semi-aquatic Reptiles that mainly eaten fish Hunted early whales and Aquatic Birds as from time to time they eat Sea vegetation or other plants around them they were filling niche of Semi-aquatic Sauropods like Cetiosaurids,Titanosaurias,Diplodocoids however they spected into Omnivorous diet then herbivorous they went extinct in early Miocene.