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]

Family Squalidae (spiny dogfishes, sleeper sharks, and relatives)Distinguished by having about as many upper teeth in anterior row as in succeeding rows. Diverse forms, habits, and sizes. Spiny dogfishes ( Squalus ) grow to about 120 cm (47.25 inches), the Greenland sleeper shark to over 6 metres…

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]

A representative squaloid, the Spiny Dogfish or "Spurdog" (Squalus acanthias) — probably the world's best known (if not most beloved) shark — showing the dorsal fin spines, transverse mouth, and lack of an anal fin characteristic of the group.

Habitat: Juveniles are pelagic, becoming benthic as they mature. Morphology: Two dorsal fins, each with a spine at the front; teeth on lower jaw not much larger than those on the upper jaw; upper precaudal pit usually present in most species; caudal peduncle with a pair of lateral keels.

The Squalidae are a wide-ranging, benthopelagic family with two genera and 33 species recognized globally. The family shows a high degree of endemism, with only one species (Squalus acanthias) known to occur in multiple geographic regions. One genus and a single species occur in the NEP.

Squalidae, more commonly known as dogfish, dog sharks, or spiny dogfish, are one of several families of sharks categorized under Squaliformes, making it the second largest order of sharks, numbering 119 species across 7 families.

The Pacific spiny dogfish (Squalus suckleyi) is a common species of the Squalidae (dogfish) family of sharks and are among the most abundant species of sharks in the world. This species is closely related to the Spiny dogfish and for many years they were treated as a single species. [4]

All squaloids possess the following characteristics: Since only one species of spiny dogfish is regularly encountered by divers, for our purposes here, characteristics of the family Squalidae can be considered the same as for the squaloid order. Size: average length 2 to 3 feet (60 to 100 centimetres); maximum 5.5 feet (160 centimetres)

Squalidae (dogfish; subclass Elasmobranchii, order Squaliformes) A fairly large family of marine sharks that have two dorsal fins, each often preceded by a solid spine. The anal fin is lacking.