Squaliformes

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Squaliformes
Scientific classification
Kingdom Information
Domain Eukaryota
Kingdom Animalia
Subkingdom Biliteria
Branch Deuterostomia
Phylum Information
Phylum Chordata
Sub-phylum Vertebrata
Infraphylum Gnathostomata
Class Information
Class Chondrichthyes
Sub-class Elasmobranchii
Order Information
Superorder Selachimorpha
Order Squaliformes
Family Information
Families Echinorhinidae
Squalidae
Oxynotidae
Centrophoridae
Etmopteridae
Somniosidae
Dalatiidae
Population statistics

Squaliformes is an order of sharks representing 7 families and 113 species of shark, with the spiny dogfish (Squalus acanthias) possibly the most abundant fish of any kind in the world's oceans. They are characterized by a lack of an anal fin, and range in size from 7.5 inches (Dwarf lanternshark, Etmopterus perryi) to 21 feet (Greenland shark, Somniosus microcephalus).