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The most famous specimens of Helicoprion are found in eastern Idaho
Derek Larson and Philip Currie in 2013
This specimen is a precise resin cast of a sculpture modeled after the original specimen
This specimen is from the Devonian of Sylvania
Stretching nearly two feet long
Orthacanthus/Xenacanths Shark skeleton Dimorphodon The most famous specimens ofOrthacanthus is an extinct genus of fresh water shark from a family of prehistoric sharks known as Xenacanths. Members of the genus had a long spine growing from the back of their skull and a very long dorsal fin, which ran all along its back giving it an eel like appearance. About 260 million years ago, Orthacanthus was the terror of freshwater swamps and bayous in Europe and North America. Its body reached nearly 10 feet (3 meters) in length and its