Ischyrhiza

Ischyrhiza or “root fish” was a prehistoric shark that lived during the Cretaceous period, about 145-65 million years ago. Ischyrhiza was approximately 7 feet in length and may have weighed as much as 200 pounds. Ischyrhiza was an ancestor of the modern “saw-sharks”. It is believed by some researchers that Ischyrhiza’s diet did not consist of fish, but rather smaller marine animals such as crustaceans and worms that resided at the bottom of the sea floor.