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Named By: Egerton in 1843
Time Period: 176-23 Ma Middle Jurassic to Miocene
Location: Worldwide with fossil sites from Europe, Russia, North America, Australia and Antarctica
Size: Up to 1.5 meters long, but size does depend upon the species
Diet: Carnivore
Fossil(s): Multiple specimens
Classification: | Chordata | Chondrichthyes | Holocephali | Chimaeriformes | Callorhynchidae |

Ischyodus is an extinct genus of cartilaginous fish belonging to the subclass Holocephali, which includes the modern-day chimaeras. Fossils are known from Europe (including Russia), North America, and New Zealand.

Ischyodus was rather similar to the present-day chimaera Chimaera monstrosa, which is found in the Atlantic Ocean and Mediterranean Sea. Just like C. monstrosa, Ischyodus had large eyes, a long whip-like tail, small lips, large pectoral fins and dorsal fin, and a dorsal spike attached to the front of the dorsal fin. The spike probably served as a method of protection against predators, and may have been venomous, as it is in modern chimaeras.

Dental plates of at least two species, Ischyodus rayhaasi and Ischyodus dolloi, have been found at several sites in North Dakota.

Read more about Ischyodus at Wikipedia
PaleoCodex is a weekend hack by Saurav Mohapatra