
Salt Water Crocodile

Fresh water crocodile
It would seem the salt water plesiosaurs all died out and that only a small group of the Fresh water species survive
“Reptiles are abhorrent because of their cold body, pale color, cartilaginous skeleton, filthy skin, fierce aspect, calculating eye, offensive smell, harsh voice, squalid habitation, and terrible venom; wherefore their Creator has not exerted his powers to make many of them.”
― Michael Crichton, Jurassic Park