The Squaliformes reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Squaliformes

Squaliformes
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Chondrichthyes Order: Squaliformes
Families
Squalidae (dogfish sharks) Centrophoridae (gulper sharks) Dalatiidae (sleeper sharks) Echinorhinidae (bramble sharks)

Squaliformes is an order of sharks that includes the smooth dogfish and spiny dogfish and others, about 80 species in four families.

Members of the order have two dorsal fins, no anal fin, and no nictitating membrane. They have five gill slits.

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