Osteodiscus Stein 1978

Diagnosis. Disk present, covered only by thin skin, skeletal; fleshy margin absent; supporting rays of disk webbed between tips, attenuate posteriorly. Mouth horizontal or oblique. Teeth sharp, with or without faint lobes. Nostrils single, relatively small. Cephalic pores normal to very large. Pectoral fin deeply notched. Vertebrae 51–59, dorsal fin rays 46–53. Pleural ribs absent. Branchiostegal rays six.

Distribution. Three species known, two from the North Pacific and one from New Zealand waters (Fig. 15).