Anatomy: This top predator was up to 11.5 ft (3.5 m) long and had large, scissor-like cutting jaws with serrated, razor-sharp bones, but no teeth. Its skull was was over 2 feet (65 cm) long. It had a jointed neck, an eel-like tail, a scale-less body, and hinged body shields.

Diet: Dunkleosteus was a carnivore (a meat-eater). It may have eaten sharks, among other marine life.

Classification: Phylum Chordata, Subphylum Vertebrata (vertebrates), Class Placodermi (armored fish), Order Arthrodira (Coccosteus, Dunkleosteus, Groenlandaspis), Family Dinichthyidae, Genus Dunkleosteus.