Sarcoprion

Sarcoprion (from the Ancient Greek, "flesh saw") is an extinctgenus of cartilaginous fish from the Late Permian of Greenland. It possessed an arching row of connected teeth, termed a tooth whorl, in its upper and lower jaws, as well as flattened, rectangular teeth elsewhere in the mouth. It is distinguished from other members of its family by the presence of sharp cutting teeth on both the upper and lower jaws. The tooth whorl on the lower jaw bore sharp, compact tooth crowns, while a row of backward facing, triangular teeth was present on the roof of the mouth. The known fossils do not show evidence of a distinct upper jaw, implying it may have been fused to the skull, reduced, or lost entirely. The type and only species in the genus is S. edax. It is a member of order Eugeneodontiformes and the larger subclass Holocephali.