The spiny dogfish, spurdog, mud shark, or piked dogfish is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. While these common names may apply to several species, Squalus acanthias is distinguished by having two spines and lacks an anal fin. It is found mostly in shallow waters and further offshore in most parts of the world, especially in temperate waters. Spiny dogfish in the northern Pacific Ocean have recently been reevaluated and found to constitute a separate species, now known as "Pacific spiny dogfish", Squalus suckleyi.
The bramble shark is one of the two species of sharks in the family Echinorhinidae. Aside from the eastern Pacific Ocean, it is found in tropical and temperate waters worldwide. This rarely encountered shark swims close to the bottom of the seafloor, typically at depths of 400–900 m (1,300–3,000 ft), though it may enter much shallower water. The bramble shark has a stout body with two small dorsal fins positioned far back and no anal fin. It can be readily identified by the large, thorn-like dermal denticles scattered over its body, some of which may be fused together. It is purplish brown or black in color and grows up to 3.1 m (10 ft) long.
Squalus is a genus of dogfish sharks in the family Squalidae. Commonly known as spurdogs, these sharks are characterized by smooth dorsal fin spines, teeth in upper and lower jaws similar in size, caudal peduncle with lateral keels; upper precaudal pit usually present, and caudal fin without subterminal notch. In spurdogs, the hyomandibula is oriented at a right angle to the neurocranium, while in other sharks, the hyomandibula runs more parallel to the body. This led some to think that the upper jaw of Squalus would not be as protractile as the jaws of other sharks. However, a study that compared different jaw suspension types in sharks showed that this is not the case and that Squalus is quite capable of protruding its upper jaw during feeding.
The Cuban dogfish is a dogfish, a member of the family Squalidae in the order Squaliformes. It is found in the Western Atlantic from North Carolina to Florida, in the Gulf of Mexico, around Cuba, Hispaniola, southern Brazil, and Argentina. It inhabits continental shelves and uppermost slopes at depths from 60 to 380 m. Its length may reach 110 cm.
The Japanese spurdog is a dogfish, a member of the family Squalidae. It is found in the western Pacific Ocean – southeastern Japan and the East China Sea, including the Republic of Korea, the Philippines, and the Arafura Sea.
The blacktailed spurdog is a dogfish, a member of the family Squalidae, found around New Caledonia in the central Pacific Ocean, at depths from 320 to 320 m. Its length is up to 75 cm.
The shortspine spurdog is a dogfish, a member of the family Squalidae, found on continental shelves off Japan in temperate waters, from the surface to 950 m. Its length is up to 75 cm.
The bartail spurdog is a dogfish of the family Squalidae, found on the continental shelf off Queensland, Australia, at depths between 220 and 450 m. The length of the longest specimen measured, an immature male, is 62 cm (24 in). Its reproduction is ovoviviparous .
The western highfin spurdog is a dogfish of the family Squalidae found on the continental shelf off Western Australia, at depths between 220 and 510 m. Its reproduction is ovoviviparous.
The western longnose spurdog is a dogfish of the family Squalidae, found on the continental shelf off the northwest and southwest coasts of Western Australia, at depths between 300 and 510 m. Its length is at least 55 cm.
The Taiwan spurdog is a species of shark in the genus Squalus. It was accidentally found in Taiwan's Tashi fish market by William Toby White and a colleague of the CSIRO in Hobart, Australia. They named it S. formosus. It has also be recorded from the coast of Japan.
The Philippine spurdog or Indonesian greeneye spurdog, is a relatively large species of dogfish shark native to waters off the coast of Australia, the Philippines, and Indonesia. The species was identified in 1912 from a specimen caught off the coast of Luzon Island, and has been both bycatch and a targeted species in fisheries since. Its taxonomy is complex, having been renamed in 1931, being misidentified as a type of shortspine spurdog, then being revived as a species in 2007.
The Pacific spiny dogfish 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 Squalus acanthias and for many years they were treated as a single species. Recent research, using meristic, morphological and molecular data led to the resurrection of Pacific Spiny Dogfish as a separate species. The American Fisheries Society recommends the common name "Pacific Spiny Dogfish" for Squalus suckleyi over alternatives such as "Spotted Spiny Dogfish" and "North Pacific Spiny Dogfish" and "Spiny Dogfish" for Squalus acanthias.
The Japanese shortnose spurdog is a dogfish shark in the genus Squalus. It is found from southern Japan to the South China Sea. The length of the longest specimen measured is 60 cm (24 in).
The greeneye spurdog is a dogfish described in 2007. It is a member of the family Squalidae, found off the coast of Australia and New Zealand. The length of the longest specimen measured is 85.6 cm (33.7 in). It was considered conspecific with the shortspine spurdog.
Edmund's spurdog is a dogfish described in 2007. It is a member of the family Squalidae, found in Asia. The length of the longest specimen measured is 70.0 cm (27.6 in).
The northern spiny dogfish, also known as brown dogfish, grey spiny dogfish, or Griffin's dogfish is a dogfish described in 1931. It is a member of the family Squalidae, found off New Zealand. The length of the longest specimen measured is 89.9 cm (35.4 in).
The Indonesian shortsnout spurdog is a dogfish described in 2007. It is a member of the family Squalidae, found off Indonesia. The length of the longest specimen measured is 52.2 cm (20.6 in).
The Seychelles spurdog is a dogfish described in 2003. It is a member of the family Squalidae, found off the Seychelles. The length of the longest specimen measured is 61.5 cm (24.2 in).
The Kermadec spiny dogfish is a dogfish described in 2007. It is a member of the family Squalidae, found off the Kermadec Islands. The length of the longest specimen measured is 68.1 cm (26.8 in).
