The Tetraodontiformes are an order of highly derived ray-finned fish, also called the Plectognathi. Sometimes these are classified as a suborder of the order Perciformes. The Tetraodontiformes are represented by 10 extant families and at least 349 species overall; most are marine and dwell in and around tropical coral reefs, but a few species are found in freshwater streams and estuaries. They have no close relatives, and descend from a line of coral-dwelling species that emerged around 80 million years ago.
Bichirs and the reedfish comprise Polypteridae, a family of archaic ray-finned fishes and the only family in the order Polypteriformes.
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments, including most numerously fish, but also mammals such as cetaceans, and even extinct ancient marine reptiles such as various known species of ichthyosaurs. Most species have only one dorsal fin, but some have two or three.
The snailfishes or sea snails are a family of marine ray-finned fishes. These fishes make up the Liparidae, which is classified within the order Scorpaeniformes.
The louvar or luvar is a species of marine ray-finned fish, it is the only extant species in the genus Luvarus and family Luvaridae. This taxon is classified within the suborder Acanthuroidei, which includes the surgeonfish, of the order Acanthuriformes. The juvenile form has a pair of spines near the base of the tail, like the surgeonfish, though they are lost in the adult.
Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology.
The Roanoke logperch is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is found in the Roanoke and Chowan drainages in Virginia and North Carolina in the United States. It inhabits low and moderate-gradient streams and rivers in warm, clear water in mostly unsilted gravel and rubble in runs, pools, and riffles. It is primarily insectivorous. This fish is a federally listed endangered species.
Careproctus pallidus is a species of snailfish found around Tierra del Fuego in the far south of South America.
Liparis montagui, or Montagu's seasnail, is a marine fish of the seasnail family (Liparidae). It inhabits the northeastern Atlantic, mainly around the British Isles, the North Sea, the Norwegian Sea, southern Iceland and as far north as the Barents Sea. It is a small, demersal fish, usually living between from the intertidal zone to 30 metres deep, where it hides under stones or algae. It mainly feeds on small invertebrates, such as small crabs, shrimp and amphipods. This species was described in 1804 by the Anglo-Irish writer, natural history illustrator, and amateur zoologist Edward Donovan with England given as the type locality. The specific name honours the English naturalist George Montagu who provided Donovan with an illustration and a description of this "beautiful little fish".
Liparis fabricii, commonly known as the gelatinous seasnail or gelatinous snailfish, is a benthopelagic species of snailfish from the Arctic Ocean. It has a tadpole-like body with a maximum length of about 20 cm (7.9 in). It is brown to black in coloration with a distinctive dark peritoneum. It preys on small crustaceans and marine worms. It is not commercially important, though it is a valuable food source for predatory fish and seabirds in the Arctic region.
Liparis is a large genus of snailfish from the northern hemisphere. They are very common in temperate and cold waters. Chernova (2008) has proposed that the genus should be subdivided into five subgenera: Liparis, Neoliparis, Lycocara, Careliparis, and Lyoliparis.
Liparis liparis, the common seasnail, striped seasnail or seasnail, is a small species of marine ray-finned fish belonging to the family Liparidae, the snailfishes, in the order Scorpaeniformes, the scorpionfishes and flatheads. It is found in the northeastern Atlantic Ocean where it lives on the seabed.
Liparis atlanticus, the Atlantic snailfish or Atlantic seasnail, is a species of marine ray-finned fish belonging to the family Liparidae, the snailfishes. This species is found in the western Atlantic Ocean off the eastern coast of North America.
Liparis mucosus, or the slimy snailfish, is a fish from the genus Liparis. The fish can be found from intertidal areas to 15 meters in depth. In general, they are not found in tide pools. The slimy snailfish ranges in the Northeastern Pacific Ocean from Sitka, Alaska to southern British Columbia, Canada as well as to Baja California, Mexico. It grows to 2.8–5 inches.
Liparis marmoratus, or the festive snailfish, is a marine ray-finned fish from the genus Liparis. It was first described by Schmidt in 1950.
Liparis agassizii, in one instance called "agassiz's snailfish", is a species of marine ray-finned fish belonging to the family Liparidae, the snailfishes. It lives in the North Pacific Ocean at a depth range between zero and one hundred meters. The fish may especially be found from the Iwate Prefecture to Hokkaido, off the coast of Primorskiy, off the western and southeastern coast of Sakhalin, and in the southern Kuril Islands.
Liparis alboventer is a species of marine ray-finned fish belonging to the family Liparidae, the snailfishes The species was originally described Careproctus alboventer by Zoya Valentinovna Krasyukova in 1984. Very little is known about the fish except from the type specimens caught. It may be found in marine habitats at ten degrees Celsius in the South Kuril Strait of the Northwest Pacific.
Liparis antarcticus is a species of marine ray-finned fish belonging to the family Liparidae, the snailfishes. This species lives in the demersal zone and can be found in the Southeast Pacific Ocean by Chile, and it is the only known species from the genus Liparis to live in the Southern Hemisphere. L. antarcticus is known only from its holotype, and the type locality of Eden Harbor in Ultima in southern Chile, may be stated in error and the specimen may have been collected off California.
Zaniolepis frenata, also known as the shortspine combfish, is a species of ray-finned fish belonging to the family Zaniolepididae.The species occurs in the eastern Pacific Ocean.
Liparis gibbus, the polka-dot snailfish, variegated snailfish or dusky snailfish, is a species of marine ray-finned fish belonging to the family Liparidae, the snailfishes. This fish is found in Arctic waters. Juveniles of the species have been found to be biofluorescent.
