The genera and species of the family "Deepwater catsharks"

Deepwater catsharks are a large family with around 110 species. They are slender sharks that can grow between 16 and 90 cm long. Most species measure around 50 cm. All species except Pentanchus profundicolus have 2 dorsal fins and one anal fin. As with catsharks, the first dorsal fin is at the level of the pelvic fins or behind them. As mostly bottom-dwelling sharks, they have a spiracle. The clear external feature that distinguishes them from catsharks is the lack of a cartilaginous ridge (supraorbital ridge) above the eye sockets. Most species lay eggs. The young sharks hatch within 2-3 years, depending on the species. Deepwater catsharks can swim several 100 meters vertically above the bottom in search of food. Their main food source is invertebrates such as squid and crabs, but they can also eat small bony fish.