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Knifefish may refer to several knife-shaped fishes: The Neotropical or weakly electric knifefishes, order Gymnotiformes, containing five families: Family Gymnotidae (banded knifefishes and the electric eel) Family Rhamphichthyidae (sand knifefishes) Family Hypopomidae (bluntnose knifefishes) Family Sternopygidae (glass and rat-tail knifefishes)
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.
This fish reaches 30 cm (12 in) in standard length. [1] The body of these fish is unusual; it is ventrolaterally flattened and elongated, giving the appearance of a knife blade. The caudal and anal fins are fused and run from beneath the gill opening to the pointed end of the body, creating a uniform, skirt-like fin. This appendage gives the ...
Nannarrup is a genus of soil centipedes in the family Mecistocephalidae. [1] [2] This genus contains only three species, including the type species Nannarrup hoffmani. [3]Also known as Hoffman's dwarf centipede, N. hoffmani was discovered in Central Park in New York City and was the first new species to be discovered in that park in more than a century. [4]
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The naked-back knifefishes are a family (Gymnotidae) of knifefishes found only in fresh waters of Central America and South America.All have organs adapted to electroreception.
The black ghost knifefish (Apteronotus albifrons) is a tropical fish belonging to the ghost knifefish family (Apteronotidae).They originate in freshwater habitats in South America where they range from Venezuela to the Paraguay–Paraná River, including the Amazon Basin. [2]
Featherbacks have slender, elongated, bodies, giving them a knife-like appearance. The caudal fin is small and fused with the anal fin, which runs most of the length of the body. Where present, the dorsal fin is small and narrow, giving rise to the common name of "featherback". The fish swims by holding its body rigid and rippling the anal fin ...