The Somniosidae are a family of sharks in the order Squaliformes, commonly known as sleeper sharks. The common name "sleeper shark" comes from their slow...

adapt to the deep sea. The common ancestor of Dalatiidae, Etmopteridae, Somniosidae, and Oxynotidae possessed a luminous organ and used bioluminescence for...

a widely distributed genus of deepwater dogfish sharks in the family Somniosidae. Several members of the genus are believed to attain lengths up to 7 m...

(Somniosidae), a family of slow-swimming sharks Portuguese dogfish (Centroscymnus coelolepis), a species of sleeper sharks in the family Somniosidae Roughskin...

Scymnodon is a genus of squaliform sharks in the family Somniosidae. There are currently four recognized species in this genus: Scymnodon ichiharai Ka...

antarcticus), is a deepwater benthopelagic sleeper shark of the family Somniosidae found in the southern and subantarctic extremes of the Atlantic, Indian...

sleeper shark (Somniosus pacificus) is a sleeper shark of the family Somniosidae, measuring up to 4.4 m (14 ft) in length, although it could possibly...

known as the gurry shark or grey shark, is a large shark of the family Somniosidae ("sleeper sharks"), closely related to the Pacific and southern sleeper...

only member of the genus Zameus, is a small sleeper shark of the family Somniosidae, found around the world between latitudes 64°N and 48°S, from the surface...

in deep water in the Pacific Ocean. It is in the sleeper shark family Somniosidae with the Greenland shark. The frog shark is known to grow to a maximum...