Dorsal spines (total): 0; Anal spines: 0. A heavily-bodied, broad-headed sixgill shark, mouth ventral with 6 rows of lower, bladelike, comb-shaped teeth on each side. Snout broadly rounded, body fusiform. Anal fin smaller than dorsal fin. Brown or grey above, paler below, with a light stripe along side Fins with white edges. Live specimens with fluorescent green eyes. Six gill slits are very long.