Helicoprion, whorl-tooth shark Dilophosaurus Lake Uinta was the longest

Lake Uinta was the longest lived

During the convergent evolution

" Other current day examples of echinoderms are starfish

The Ward's catalog describes the skeleton "Skeleton found on the north-central cost of the main-land of Guadeloupe

This is a greatly enlarged sculpture of a Megalodon tooth

Helicoprion, whorl-tooth shark Dilophosaurus Lake Uinta was the longestHelicoprion ("Spiral Saw") was a long lived genus of shark like cartilaginous fish that first arose in the oceans of the late Carboniferous 280 million years ago, survived the Permian Triassic Extinction Event, and eventually went extinct during the early Triassic some 225 million years ago. The only fossils known are the teeth, which were arranged in a fantastic "tooth whorl" strongly reminiscent of a circular saw. It was not until the discovery of