Bathysaurus mollis is a species of fish in the family Bathysauridae, commonly called bathysaur or highfin lizardfish.
References
Kenneth J. Sulak, Charles A. Wenner, George R. Sedberry, and Louis Van Guelpen, The life history and systematics of deep-sea lizard fishes, genus Bathysaurus (Synodontidae), Can. J. Zool. 63(3): 623–642 (1985).