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Order Summary for Squaliformes
Main Ref.:	Nelson, J.S., 1994
Order:	Squaliformes    bramble, sleeper and dogfish sharks
Class:	Elasmobranchii (sharks and rays)
Sister Order:	Squatiniformes     155 M years
Ref.:	Shirai, S., 1996
First fossil record:	late Jurassic
Occurs in:	Marine      Freshwater      Brackish
Remarks:	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.
Class etymology:	Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335.
Order etymology:	Latin, squalus, squalidus = weak, pale, with rough skin + Latin, forma = shape. Ref. 45335.
Families:	4 Centrophoridae , Dalatiidae , Echinorhinidae , Etmopteridae , Oxynotidae , Somniosidae , Squalidae

Identification keys | Tree of Life

Ref.:   ( e.g. 9948)
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Page created by: Eli, 17.10.00, last modified by Eli, 15.02.05.