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Nelson, J.S., 1994

Squaliformes sleeper and dogfish sharks

Elasmobranchii

Squatiniformes 155 M years

Shirai, S., 1996  | 

late Jurassic

Marino

Fresh

Salmastro

Two dorsal fins, with or without spines; anal fin absent; five gill slits; spiracles present; nictitating lower eyelid absent. Many species are known from deep water.

Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335.

Latin, squalus, squalidus = weak, pale, with rough skin + Latin, forma = shape (Ref. 45335).

( n = 6 ) -
Centrophoridae Dalatiidae Etmopteridae Oxynotidae Somniosidae Squalidae

Ref.
[ e.g. 9948]                       

Glossary
                    [ e.g. cephalopods]