Found in deep water. Ovoviviparous (Ref. 205). Has large oily liver which helps it to become neutrally buoyant (`hepatic float'). Its powerful jaws, big mouth and enormous lower teeth enable it to bite off large portion of its prey in one sweeping motion. A facultative ectoparasite evidenced by its suctorial lips and feeding apparatus. It has extremely short snout and anteriorly positioned eyes which allows for binocular vision. Minimum depth from Ref. 58018.