Triacanthidae

Triacanthidae; Temporal range: Eocene–Recent PreꞒ Ꞓ O S D C P T J K Pg N
	Triplespine; Triacanthus biaculeatus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Tetraodontiformes
Family:	Triacanthidae; Bleeker, 1859
Genera
	see text

Triacanthidae, the triplespines or tripodfishes, is a family of marine ray-finned fishes belonging to the order Tetraodontiformes, whicj also includes the pufferfishes, boxfishes, filefishes and related groups. The family is made up of four extant genera and three extinct genera which are known from fossils.

Taxonomy

Triacanthidae was first proposed as a family in 1859 by the Dutch physician, herpetologist and ichthyologist Pieter Bleeker,^[1] and, in 1968, James C. Tyler classified it within the suborder Triacanthoidei alongside the Triacanthodidae.^[2] The 5th edition of Fishes of the World classifies this as suborder of the order Tetraodontiformes.^[3]

Genera

Triacanthidae contains the following extant genera:^[4]

Pseudotriacanthus Fraser-Brunner, 1941
Triacanthus Oken, 1817
Tripodichthys Tyler, 1968
Trixiphichthys Fraser-Brunner, 1941

Characteristics

Triacanthidae triplespines's, like their relatives the triggerfishes and the filefishes first ray of the dorsal fin is formed to a spine. Further, they have two spines in place of their ventral fins. They have sharp and heavy teeth, which they use to eat hard-shelled molluscs and crustaceans.^[5]

Not much is known about how the fish live. They are essentially offshore fish that only come close to land occasionally. They range from 15 to 30 centimetres (5.9 to 11.8 in) in length.

Fossil record

The genus Acanthopleurus is known from the species A. serratus Agassiz, 1844 and A. collettei Tyler, 1980 of the Oligocene of Glarus canton, Switzerland. A third described species Cephalacanthus trispinosus Ciobanu, 1977 from the Oligocene of Romania, formerly in the family Dactylopteridae, has been considered to be a juvenile specimen of Acanthopleurus, though whether it belongs with one of the two described species or a new species is not yet determined.^[6] Other fossil triplespine genera include Cryptobalistes, also from Glarus, as well as Protacanthodes from Monte Bolca, Italy.^[7]

References

^ Richard van der Laan; William N. Eschmeyer & Ronald Fricke (2014). "Family-group names of recent fishes". Zootaxa. 3882 (2): 1–230. doi:10.11646/zootaxa.3882.1.1. PMID 25543675.
^ Franceso Santini; James C. Tyler (2003). "A phylogeny of the families of fossil and extant tetraodontiform fishes (Acanthomorpha, Tetraodontiformes), Upper Cretaceous to Recent". Zoological Journal of the Linnean Society. 139 (4): 565–617. doi:10.1111/j.1096-3642.2003.00088.x.
^ Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 518–526. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. LCCN 2015037522. OCLC 951899884. OL 25909650M.
^ Matsuura, K. (2014). "Taxonomy and systematics of tetraodontiform fishes: a review focusing primarily on progress in the period from 1980 to 2014". Ichthyological Research. 62 (1): 72–113. Bibcode:2015IchtR..62...72M. doi:10.1007/s10228-014-0444-5.
^ Matsura, K. & Tyler, J.C. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 228. ISBN 0-12-547665-5.
^ Tyler, J.C., Jerzmariska, A., Bannikov, A.F. & Swidnicki, J. (1993): Two New Genera and Species of Oligocene Spikefishes (Tetraodontiformes: Triacanthodidae), the First Fossils of the Hollardiinae and Triacanthodinae. Smithsonian Contributions To Paleobiology, 75
^ Santini, Francesco; Tyler, James C. (2002). "Phylogeny and biogeography of the extant species of triplespine fishes (Triacanthidae, Tetraodontiformes)". Zoologica Scripta. 31 (4): 321–330. doi:10.1046/j.1463-6409.2002.00097.x. ISSN 0300-3256.

[VDLEF-1] Richard van der Laan; William N. Eschmeyer & Ronald Fricke (2014). "Family-group names of recent fishes". Zootaxa. 3882 (2): 1–230. doi:10.11646/zootaxa.3882.1.1. PMID 25543675.

[SantiniTyler2003-2] Franceso Santini; James C. Tyler (2003). "A phylogeny of the families of fossil and extant tetraodontiform fishes (Acanthomorpha, Tetraodontiformes), Upper Cretaceous to Recent". Zoological Journal of the Linnean Society. 139 (4): 565–617. doi:10.1111/j.1096-3642.2003.00088.x.

[Nelson5-3] Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 518–526. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. LCCN 2015037522. OCLC 951899884. OL 25909650M.

[Matsuura2014-4] Matsuura, K. (2014). "Taxonomy and systematics of tetraodontiform fishes: a review focusing primarily on progress in the period from 1980 to 2014". Ichthyological Research. 62 (1): 72–113. Bibcode:2015IchtR..62...72M. doi:10.1007/s10228-014-0444-5.

[EoF-5] Matsura, K. & Tyler, J.C. (1998). Paxton, J.R. & Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 228. ISBN 0-12-547665-5.

[6] Tyler, J.C., Jerzmariska, A., Bannikov, A.F. & Swidnicki, J. (1993): Two New Genera and Species of Oligocene Spikefishes (Tetraodontiformes: Triacanthodidae), the First Fossils of the Hollardiinae and Triacanthodinae. Smithsonian Contributions To Paleobiology, 75

[7] Santini, Francesco; Tyler, James C. (2002). "Phylogeny and biogeography of the extant species of triplespine fishes (Triacanthidae, Tetraodontiformes)". Zoologica Scripta. 31 (4): 321–330. doi:10.1046/j.1463-6409.2002.00097.x. ISSN 0300-3256.

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