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Squaliformes

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(Redirected from Squaliform) Order of fishes

Squaliformes
Temporal range: Late Jurassic–Recent PreꞒ O S D C P T J K Pg N
Pacific spiny dogfish, Squalus suckleyi
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Division: Selachii
Superorder: Squalomorphi
Order: Squaliformes
Goodrich, 1909
Type species
Squalus acanthias
Linnaeus, 1758

The Squaliformes /ˌskwɒlɪˈfɔːrmiːz/ 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. In most other respects, however, they are quite variable in form and size. Most species of the squaliform order live in saltwater or brackish water. They are found worldwide, from northern to tropical waters, and from shallow coastal seas to the open ocean.

All members of the family Etmoperidae and Dalatiidae and Zameus squamulosus possess photophores, luminous organs, and exhibit intrinsic bioluminescence. Bioluminescence evolved once in Squaliformes, approximately 111–153 million years ago, and helped the Squaliformes radiate and adapt to the deep sea. The common ancestor of Dalatiidae, Etmopteridae, Somniosidae, and Oxynotidae possessed a luminous organ and used bioluminescence for camouflage by counterillumination. Counterillumination is an active form of camouflage in which an organism emits light to match the intensity of downwelling light to hide from predators below. Currently, bioluminescence provides different functions for Squaliformes based on the family. Dalatiidae and Zameus squamulosus possess simple photophores and use bioluminescence for ventral counter-illumination. Etmopteridae possess more complex photophores and utilize bioluminescence for ventral counter illumination as well as species recognition.

Many squaliforms have a spine in front of each of the two dorsal fins, likely a trait of the common ancestor of this clade. The clade likely originated in the post-Jurassic shallow waters of the northern Tethyal margin.

Classification

Family Centrophoridae Bleeker, 1859 (gulper sharks)

Family Dalatiidae (J. E. Gray, 1851) (kitefin sharks)

Family Echinorhinidae Theodore Gill, 1862 (bramble sharks)

Family Etmopteridae Fowler, 1934 (lantern sharks)

Family Oxynotidae Gill, 1872 (rough sharks)

Family Somniosidae D. S. Jordan, 1888 (sleeper sharks)

Family Squalidae Blainville, 1816 (dogfish sharks)

Family Image Common name Genera Species Description
Centrophoridae Gulper sharks 2 20 Gulper sharks are usually deepwater fish. While some, such as the gulper shark Centrophorus granulosus, are found worldwide and fished commercially, others are uncommon and little-known. Their usual prey is other fish; some are known to feed on squid, octopus, and shrimp. Some species live on the bottom (benthic), while others are pelagic. They are ovoviviparous, with the female retaining the egg-cases in her body until they hatch. They are small to medium sharks, ranging from 79 centimetres (2.59 ft) to 164 centimetres (5.38 ft) in adult body length.
Dalatiidae Kitefin sharks 7 10 Kitefin sharks are small, under 2 m (6.6 ft) long, and are found worldwide. They have cigar-shaped bodies with narrow heads and rounded snouts. Several species have specialized bioluminescent organs. The term kitefin shark is also used as the common name for the type species of the family, Dalatias licha.
Echinorhinidae Bramble sharks 1 2 Bramble sharks are usually benthic fish found in tropical and temperate waters worldwide, while the prickly shark is found in the deep waters of the Pacific Ocean. Their usual prey is small fish, cephalopods, and crustaceans. They are ovoviviparous, with the female retaining the egg cases in her body until they hatch. They are relatively large sharks, ranging from 3.1 to 4 metres (10 to 13 ft) in adult body length.
Etmopteridae Lantern sharks 5 45 Lantern sharks are deepwater fish with light-producing photophores on their bodies. The members of this family are small, under 90 cm (35 in) long, and are found worldwide.
Oxynotidae Rough sharks 1 5 Rough sharks are characterised by two large dorsal fins, each with a sharp spine, and with the first fin placed far forward above the head. Their bodies are compressed, giving them a triangular cross-section. Their skins are even rougher and more prickly than the dogfishes (below). Rough sharks are small to medium in size, ranging from 49 to 150 centimetres (1.61 to 4.92 ft) in adult body length, depending on species. They are deepwater sharks possessing a luminous organ which live in Atlantic and western Pacific oceans.
Somniosidae Sleeper sharks 7 20 Sleeper sharks are a poorly studied deep-sea shark found in all oceans. They contain antifreeze to survive in cold temperatures, and may feed on colossal squid. In Iceland, they are hunted for food. They are allowed to rot for months until the poisonous antifreeze degrades, and they are safe to eat.
Squalidae Dogfish sharks 3 31 Dogfish sharks have two dorsal fins, each with smooth spines, but no anal fin. Their skin is generally rough to the touch. These sharks are characterized by teeth in upper and lower jaws similar in size; caudal peduncle with lateral keels; upper precaudal pit usually present; and a caudal fin without a subterminal notch. Unlike nearly all other shark species, dogfish possess venom, which coats their dorsal spines and is mildly toxic to humans. Their livers and stomachs contain also the compound squalamine, which possesses the property of reduction of small blood vessel growth in humans.

References

  1. Froese, Rainer; Pauly, Daniel (eds.). "Order Squaliformes". FishBase. January 2009 version.
  2. Stevens, J. & Last, P.R. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 64. ISBN 978-0-12-547665-2.
  3. ^ Flammesbeck, C. K.; Pollerspöck, J.; Schedel, F. D. B.; Matzke, N. J.; Straube, N. (2018). "Of teeth and trees: a fossil tip dating approach to infer divergence times of extinct and extant squaliform sharks". 2dh Annual Conference of the European Elasmobranch Association: 57.
  4. Davis, M. P.; Sparks, J. S.; Smith, W. L. (2016). "Repeated and widespread evolution of bioluminescence in marine fishes". PLOS ONE. 11 (6): e0155154. Bibcode:2016PLoSO..1155154D. doi:10.1371/journal.pone.0155154. PMC 4898709. PMID 27276229.
  5. ^ Straube, N.; Li, C.; Claes, J. M.; Corrigan, S.; Naylor, J. P. (2015). "Molecular phylogeny of squaliformes and first occurrence of bioluminescence in sharks". BMC Evolutionary Biology. 15 (1): 62. Bibcode:2015BMCEE..15..162S. doi:10.1186/s12862-015-0446-6. PMC 4537554. PMID 26277575.
  6. Hastings, J. W. (1971). "Light to hide by: ventral luminescence to camouflage the silhouette". Science. 173 (4001): 1016–1017. Bibcode:1971Sci...173.1016W. doi:10.1126/science.173.4001.1016. PMID 17796582. S2CID 5680392.
  7. Claes, J. M.; Mallefet, J. (2009). "Bioluminescence of sharks: first synthesis". Kerala: Research Signpost: 51–65.
  8. Claes, J. M.; Nilsson, D. E.; Mallefet, J.; Straube, N. (2015). "The presence of lateral photophores correlates with increased speciation in deep-sea bioluminescent sharks". Royal Society Open Science. 2 (7): 150219. Bibcode:2015RSOS....250219C. doi:10.1098/rsos.150219. PMC 4632593. PMID 26587280.
  9. Kriwet, Jürgen; Klug, Stefanie (2009-01-01). Biology and Management of dogfish sharks. American Fisheries Society, Bethesda, Maryland. pp. 19–38.
  10. Froese, Rainer; Pauly, Daniel (eds.). "Family Centrophoridae". FishBase. January 2009 version.
  11. Hamlett, W.C., ed. (1999). Sharks, Skates, and Rays: The Biology of Elasmobranch Fishes. JHU Press. pp. 16–17. ISBN 978-0-8018-6048-5.
  12. Froese, Rainer; Pauly, Daniel (eds.). "Family Echinorhinidae". FishBase.
  13. Froese, Rainer; Pauly, Daniel (eds.). "Family Etmopteridae". FishBase. February 2011 version.
  14. Froese, Rainer; Pauly, Daniel (eds.). "Family Oxynotidae". FishBase. January 2009 version.
  15. Murray, Brent William; Wang, John Y.; Yang, Shih-Chu; Stevens, John D.; Fisk, Aaron; Svavarsson, Jörundur (2008). "Abstract". Marine Biology. 153 (6): 1015–1022. doi:10.1007/s00227-007-0871-1. S2CID 44189738.
  16. "Family Somniosidae - Sleeper sharks". Fish Base. Retrieved 29 December 2012.
  17. Simon, Matt (2012-07-05). "Footnotes: Lazy Sharks, Humiliated Seals, and Googlers Eating Dog Food | Wired Opinion". Wired. Retrieved 2012-07-05.
  18. Froese, Rainer; Pauly, Daniel (eds.). "Family Squalidae". FishBase. January 2009 version.
  19. "From the Belly of a Shark, a Cancer Cure?". National Geographic. Vol. 193, no. 6. June 1998. p. 202. Retrieved 2 January 2023.

Further reading

Sharks
Topics
Taxonomy
Human
interaction
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Elasmobranchii
Selachii (sharks)
Batoidea (rays)
Holocephali
Extant shark species
Order Carcharhiniformes (Ground sharks)
Hemigaleidae
(Weasel sharks)
Hemipristis
Chaenogaleus
Hemigaleus
Paragaleus
Leptochariidae
Leptocharias
Proscylliidae
(Finback sharks)
Ctenacis
Eridacnis
Proscyllium
Pseudotriakidae
Gollum
Pseudotriakis
Sphyrnidae
(Hammerhead sharks)
Eusphyra
Sphyrna
Triakidae
(Houndsharks)
Furgaleus
Galeorhinus
Gogolia
Hemitriakis
Hypogaleus
Iago
Mustelus
(Smooth-hounds)
Scylliogaleus
Triakis
Carcharhinidae
  • Large family listed below
Scyliorhinidae
  • Large family listed below
Family Carcharhinidae (Requiem sharks)
Carcharhinus
Galeocerdo
Glyphis
(River sharks)
Isogomphodon
Lamiopsis
Loxodon
Nasolamia
Negaprion
Prionace
Rhizoprionodon
Scoliodon
Triaenodon
Family Scyliorhinidae (Catsharks)
Apristurus
Asymbolus
Atelomycterus
Aulohalaelurus
Cephaloscyllium
Cephalurus
Figaro
Galeus
Halaelurus
Haploblepharus
Holohalaelurus
Parmaturus
Pentanchus
Poroderma
Schroederichthys
Scyliorhinus
Order Echinorhiniformes (Bramble sharks)
Echinorhinidae
Echinorhinus
Order Heterodontiformes (Bullhead sharks)
Heterodontidae
Heterodontus
Order Hexanchiformes
Chlamydoselachidae
Chlamydoselachus
Hexanchidae
(Cow sharks)
Heptranchias
Hexanchus
Notorynchus
Order Lamniformes (Mackerel sharks)
Alopiidae
Alopias
(Thresher sharks)
Cetorhinidae
Cetorhinus
Lamnidae
Carcharodon
Isurus
Lamna
Megachasmidae
Megachasma
Mitsukurinidae
Mitsukurina
Odontaspididae
Carcharias
Odontaspis
Pseudocarchariidae
Pseudocarcharias
Order Orectolobiformes (Carpet sharks)
Brachaeluridae
Brachaelurus
Heteroscyllium
Ginglymostomatidae
(Nurse sharks)
Ginglymostoma
Nebrius
Pseudoginglymostoma
Hemiscylliidae
(Bamboo sharks)
Chiloscyllium
Hemiscyllium
Orectolobidae
(Wobbegongs)
Eucrossorhinus
Orectolobus
Sutorectus
Parascylliidae
(Collared carpet sharks)
Cirrhoscyllium
Parascyllium
Rhincodontidae
Rhincodon
Stegostomatidae
Stegostoma
Order Pristiophoriformes (Sawsharks)
Pristiophoridae
Pliotrema
Pristiophorus
Order Squaliformes
Centrophoridae
(Gulper sharks)
Centrophorus
Deania
Dalatiidae
Euprotomicroides
Heteroscymnoides
Mollisquama
Dalatias
Isistius
Euprotomicrus
Squaliolus
Etmopteridae
Aculeola
Centroscyllium
Etmopterus
(Lantern sharks)
Miroscyllium
Trigonognathus
Oxynotidae
(Rough sharks)
Oxynotus
Somniosidae
(Sleeper sharks)
Centroscymnus
Centroselachus
Proscymnodon
Scymnodalatias
Scymnodon
Somniosus
Zameus
Squalidae
(Dogfish sharks)
Cirrhigaleus
Squalus
(Spurdogs)
Order Squatiniformes (Angel sharks)
Squatinidae
Squatina
Taxon identifiers
Squaliformes
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