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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]
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. They have long bodies and swim using undulations of their elongated anal fin.
The African knifefish, Gymnarchus niloticus – also called the aba aba [a] – is an electric fish, living at the bottoms of rivers and lakes. It is the only species in the genus Gymnarchus and the family Gymnarchidae , within the order Osteoglossiformes .
Like the other gymnotiforms, gymnotids have classic knifefish bodies. The body is long and eel-like, the dorsal fin and pelvic fins are absent, and the anal fin is extremely long and used for movement.
Papyrocranus afer (Günther, 1868) (reticulated knifefish) Papyrocranus congoensis (Nichols & La Monte, 1932) Genus Xenomystus Günther, 1868. Xenomystus nigri (Günther, 1868) (African brown knifefish) Subfamily Notopterinae Bleeker 1851 (Asian knifefishes, Asian featherbacks) Genus Chitala Fowler, 1934
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]