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Triacanthidae
Triacanthidae, commonly known as triplespines or tripodfishes, is a family of Indo-Pacific fishes. It is classified in the order Tetraodontiformes, along with the pufferfishes and the ocean sunfish. The family consists of seven species in four genera, in addition to one extinct genus that only is known from fossils.
Much like their relatives the triggerfish and the filefish, the triplespines's 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.
Not much is known about how the fish live. They are essentially offshore fish that only come close to land occasionally. They range from 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.〔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''〕
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