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Eigenmannia vicentespelaea is a species of weakly electric knifefish in the family Sternopygidae.Native to the São Domingos karst area in central Brazil, it is the only known knifefish to exclusively inhabit caves.
Sand knifefish are freshwater electric fish of the family Rhamphichthyidae, from freshwater habitats in South America. [1] Just like most part of the members of the Gymnotiformes group, they also have elongated and compressed bodies and electric organs. The long anal fin actually extends from before the pectoral fins to the tip of the tail.
Despite the name, the electric eel is a type of knifefish. The Gymnotiformes / dʒ ɪ m ˈ n ɒ t ɪ f ɔːr m iː z / are an order of teleost bony fishes commonly known as Neotropical knifefish or South American knifefish. They have long bodies and swim using undulations of their elongated anal fin.
[1] [2] They are typically found in slow-flowing streams, along the edge of large rivers, in deep river channels and in floodplains, and the genus also includes E. vicentespelaea, the only cave-adapted knifefish. [2] [3] Eigenmannia are often found near submerged roots, aquatic plants and floating meadows. [3] [4]
[5] [9] Like other Neotropical knifefish, they often lose their tail due to attacks by predators or aggressive encounters with conspecifics, but they are able to regenerate it. [14] The largest Gymnotus are up to 100 cm (3.3 ft) in total length. [5] [9] Most species reach less than one-third that size and the smallest only around 10 cm (4 in) long.
They are small to medium sized knifefish, reaching up to 12–46 cm (4.7–18.1 in) in total length depending on the species involved. [1] [2] Overall the various species are similar in general shape, but they do differ in morphometrics and meristics. They vary in general color and pattern, but are well-camouflaged and typically brownish ...
The clown featherback (Chitala ornata), also known as the clown knifefish and spotted knifefish, is a nocturnal species of tropical fish with a long, knife-like body. This knifefish is native to freshwater habitats in Cambodia, China, Hong Kong, Laos, Macau, Thailand, and Vietnam, [2] but it has also been introduced to regions outside its native range. [1]
The two recognized species are both small knifefish, with the largest being M. bilineatus at up to 12 cm (4.7 in) in total length. The other is M. brevis, which at up to only 5.3 cm (2.1 in) is the world's smallest knifefish. [2] [3] Microsternarchus are very similar to Brachyhypopomus. [4]