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 dogfish sharks[?] 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[?].