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The Squaliformes / ˌ s k w ɒ l ɪ ˈ f ɔːr m iː z / are an order of sharks that includes about 126 species in seven families. Members of the order have two dorsal fins , which usually possess spines, they usually have a sharp head, no anal fin or nictitating membrane , and five to seven gill slits .
The order Squaliformes is a large, ancient order of sharks. Sharks from this order have two dorsal fins -usually with spines-, no anal fin, and no nictitating membrane on the eyes. Squaliform sharks are extremely variable in size and shape, and can be found in most marine habitats throughout the world.
Squalidae, more commonly known as dogfish, dog sharks, or spiny dogfish, [3] are one of several families of sharks categorized under Squaliformes, making it the second largest order of sharks, numbering 119 species across 7 families. [4]
The spiny dogfish (Squalus acanthias), spurdog, mud shark, or piked dogfish [4] is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. [5] While these common names may apply to several species, Squalus acanthias is distinguished by two spines (one anterior to each dorsal fin) and ...
Oxynotus is a genus of sharks in the order Squaliformes, commonly known as the rough sharks. It is the only extant genus in the family Oxynotidae. They live in deep waters in the Atlantic and western Pacific Oceans. Rough sharks are small to medium in size, ranging from 49 to 150 cm (1.61 to 4.92 ft) in adult body length, depending on species.
The Somniosidae are a family of sharks in the order Squaliformes, commonly known as sleeper sharks. [1] The common name " sleeper shark " comes from their slow swimming, low activity level, and perceived non-aggressive nature.
They are small to medium sharks, ranging from 79 to 164 cm (2.59 to 5.38 ft) in adult body length. The members of the genus Deania generally have a long flattened snout. Gulper shark ( Centrophorus granulosus ) Dumb gulper shark ( Centrophorus harrissoni ) Leafscale gulper shark ( Centrophorus squamosus ) Birdbeak dogfish ( Deania calcea )
The Dalatiidae are the family of kitefin sharks of the order Squaliformes (the term "kitefin shark" also refers specifically to the species Dalatias licha). Members of this family are small, under 2 m (6.6 ft) long, and are found worldwide. They have cigar-shaped bodies with narrow heads and rounded snouts.