The Squaliformes are an order of sharks that includes about 126 species in seven families.
Apristurus is a genus of catsharks, the family Pentanchidae, the deepwater catsharks. The species in this genus are commonly known as the ghost or demon catsharks.
The blackbelly lanternshark or lucifer shark is a shark of the family Etmopteridae found around the world in tropical and temperate seas at depths between 150 and 1,250 meters – the mesopelagic zone. Compared to other mesopelagic fish predators and invertebrates, the blackbelly lanternshark is thought to reside in shallower, more southern waters. E. lucifer can reach up to 47 centimeters in length and consumes mesopelagic cephalopods, fish, and crustaceans. Blackbelly lanternsharks are bioluminescent, using hormone controlled mechanisms to emit light through ventral photogenic organs called photophores and are presumed to be ovoviviparous. The blackbelly lanternshark has been classified as "Not Threatened" within the New Zealand Threat Classification System.
The rasptooth dogfish is a dogfish, found on the Kyushu–Palau Ridge in the northwest Pacific Ocean at depths of 360 m. Its maximum length is unknown. This species was originally described as Centroscyllium sheikoi, and subsequently allocated to the newly named genus Miroscyllium based on anatomical features not shared with other Centroscyllium. More recent molecular data suggest this species belongs to the genus Etmopterus, but as of June 2014 Miroscyllium sheikoi remains the valid name recognized by FishBase, the Catalog of Fishes World Register of Marine Species, and the IUCN
The blurred lanternshark is a little-known species of dogfish shark in the family Etmopteridae, found around the world in benthic and pelagic habitats from a depth of 110 m (360 ft) to over 1 km (0.62 mi) down. This shark forms the E. pusillus species group with the smooth lanternshark, which are distinguished from other members of its family by having irregularly arranged, flat-topped dermal denticles that give them a "smooth" appearance. Both species are slender-bodied with long heads, two dorsal fins bearing spines, no anal fins, and light-emitting photophores. The blurred lanternshark is larger, reaching 67 cm (26 in) or more in length. This species feeds on small squid, fishes, and fish eggs, and is ovoviviparous. It has been assessed as of Least Concern by the International Union for Conservation of Nature, because of its wide distribution and lack of threat from fishing pressure.
The velvet belly lanternshark is a species of dogfish shark in the family Etmopteridae. One of the most common deepwater sharks in the northeastern Atlantic Ocean, the velvet belly is found from Iceland and Norway to Gabon and South Africa at a depth of 20–2,490 m (66–8,169 ft). A small shark generally no more than 45 cm (18 in) long, the velvet belly is so named because its black underside is abruptly distinct from the brown coloration on the rest of its body. The body of this species is fairly stout, with a moderately long snout and tail, and very small gill slits. Like other lanternsharks, the velvet belly is bioluminescent, with light-emitting photophores forming a species-specific pattern over its flanks and abdomen. The ventral photophores are thought to function in counter-illumination, which camouflages the shark against predators and prey. The bioluminescent flank markings may play a role in intraspecific communication.
The Hawaiian Lanternshark is a species of small squaliform shark in the family Etmopteridae.
The fringefin lanternshark is a shark of the family Etmopteridae found in the western central Atlantic from Texas to Florida, northern Gulf of Mexico, and Mexico. It is endemic to this area. It is a deep water shark and is found about 220 to 915 meters below the surface, on the upper continental slopes of the Gulf. E. schultzi is a small shark, about 27–30 cm long and feeds on squid. It is also bioluminescent, which counter-illuminates it and helps with intraspecific interaction. Due to its limited range and the difficulty of collecting deep water species, it has not been evaluated by the IUCN Red List, but due to recent oil spills in the Gulf of Mexico, it is likely that fringefin lanternsharks have decreased in population.
The smalleye lanternshark is a shark of the family Etmopteridae found in the southeast Pacific off Peru and Chile, at depths between 630 and 1,100 m. Its length is up to 61 cm (24 in).
The thorny lanternshark is a shark of the family Etmopteridae found in the western Indian Ocean between latitudes 0° and 31°S, at depths between 200 and 500 m. Its length is up to 27 cm.
Etmopterus burgessi, sometimes known as the broad-snout lanternshark, is a lanternshark of the family Etmopteridae in the order Squaliformes. It is found only around Taiwan.
Bythaelurus is a genus of sharks belonging to the family Pentanchidae, the deepwater catsharks. The genus Bythaelurus Compagno 1988 was first described as a subgenus of Halaelurus Gill 1862 based on several morphological characteristics including a soft body with thin skin, a bluntly rounded snout without a pointed, knob-like tip, and eyes not noticeably elevated on the dorsal surface of the head. Members of this genus are generally found in deep water and have more somber body coloration.
Hydrolagus is a genus of fish in the family Chimaeridae found in the Atlantic, Indian and Pacific Oceans.
The shortfin smooth lanternshark is a shark of the family Etmopteridae found off the northeastern coast of Taiwan, at depths of between 430 and 550 m.
The sculpted lanternshark is a shark of the family Etmopteridae found from the Southeast Atlantic and Southwest Indian Ocean, specifically from Namibia to southern Mozambique and the Madagascar Ridge. Etmopterus sculptus is a moderately large species of Etmopterus.
The blue-eye lanternshark, also known as the traveller lanternshark or slate lanternshark is a shark of the family Etmopteridae.
Barrie's lanternshark is a species of lanternshark of the family Etmopteridae, found in the Southwest Indian Ocean and Southeast Atlantic Ocean. It lives on seamounts and continental slopes at depths of 480–1,200 m (1,570–3,940 ft). This deep-water shark was previously misidentified with sculpted lanternshark and also resembles blackbelly lanternshark in having linear rows of dermal denticles.
Laila's lanternshark is a species of lanternshark of the family Etmopteridae, found in the northwestern Hawaiian Islands. It inhabits the seamounts at depths of 314–384 m (1,030–1,260 ft). This species resembles Blackbelly lanternshark in having linear rows of dermal denticles.
