A new prehistoric shark, Diablodontus michaeledmundi aka “Devil-Tooth,” has been found in a chunk of Flagstaff, Ariz., limestone.
The shark must have been super tough, as its species survived the world’s biggest extinction event (the Permian-Triassic extinction).
Devil Tooth not only had wickedly shark teeth, it also sported head spikes that gave it a devilish appearance. The spikes either evolved for defense or for sexual selection. In other words, the spikes must have turned on members of the opposite sex, similar to how horns of some animals today catch the eyes of potential mates.
The shark, discovered in what is known as the Kaibab Formation of Arizona, represents a new extinct genus and species. It is described in the New Mexico Museum of Natural History and Science Bulletin.
For the rest of the story: http://news.discovery.com/animals/sharks/prehistoric-devil-tooth-shark-found-in-arizona-130804.htm#mkcpgn=rssnws1