Squaliformes is an order of sharks that includes about 80 species in seven families.
Members of the order have two dorsal fins, which usually possess spines, no anal fin or nictitating membrane, and five gill slits. In most other respects, however, they are quite variable in form and size. They are found worldwide, from polar to tropical waters, and from shallow coastal seas to the open ocean.[2]
[edit] Classification
Family Centrophoridae (gulper sharks)
Family Dalatiidae (kitefin sharks) (Gray, 1851)
Family Echinorhinidae (bramble sharks)
Family Etmopteridae (lantern sharks) Fowler, 1934
Family Oxynotidae (rough sharks) Gill, 1872
Family Somniosidae (sleeper sharks) Jordan, 1888
Family Squalidae (dogfish sharks)
[edit] References
- ^ "Squaliformes". FishBase. Ed. Ranier Froese and Daniel Pauly. January 2009 version. N.p.: FishBase, 2009.
- ^ Stevens, J. & Last, P.R. (1998). Paxton, J.R. & Eschmeyer, W.N.. ed. Encyclopedia of Fishes. San Diego: Academic Press. p. 64. ISBN 0-12-547665-5.
