Hybodus fraasi from the Solnhofen limestone at the Museum of Natural History, Berlin
There were large growing, partly over 2.5 meters long predators that fed on fish and cephalopods. The head of the body was large and blunt, massive. The upper lobe of the caudal fin heterocerken had moved out long, the lower lobe relatively small. Before each of the two dorsal fins was a powerful sting. The pectoral fins were long. Behind the eyes wore the male hook-shaped head spines. The teeth had a broad base, with a main and several subsidiary peaks. In the tip of the instrument were smaller gripper teeth. First fossil teeth of Hybodus were found in 1845 in England.