Nematogenys inermis
| Nematogenys inermis | ||||||||||||
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Nematogenys inermis |
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| Systematics | ||||||||||||
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| Scientific name of the family | ||||||||||||
| Nematogenyidae | ||||||||||||
| Eigenmann , 1927 | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Nematogenys | ||||||||||||
| Girard , 1855 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Nematogenys inermis | ||||||||||||
| ( Guichenot , 1848) |
Nematogenys inermis is a catfish-like fish and the only recent species inthe Nematogenyidae family (pencil catfish). It occurs endemically in central and southern Chile from Valparaíso to Osorno at the bottom of rivers, mainly between the submerged roots of trees.
features
Nematogenys inermis is an elongated, scale-less fish that usually reaches a length of up to 20, at most probably a little over 40 centimeters in length. The body is speckled, with the coloration varying between different populations. The head has a pair of barbels on the upper jaw and chin and a very short pair next to the nostrils. The gill cover has no spines. The rayless dorsal fin sits in the middle of the body over the pelvic fins . The hard ray of the pectoral fins is sawn at the rear end. An adipose fin is missing.
Systematics
Nematogenys inermis is the only recent species in the family; a fossil species has also been described with Nematogenys cuivi . Within the superfamily of the Loricarioidea , Nematogenys probably forms the sister group to the loach catfish (Trichomycteridae), to which the species was also previously assigned.
Duration
While the species was still frequently used as a food fish at the beginning of the twentieth century , it is considered very rare today , probably due to habitat loss and neozoa . Exact numbers are unknown.
proof
- ^ A b c Roberto E. Reis, Sven O. Kullander, Carl J. Ferraris (Eds.): Check list of the freshwater fishes of South and Central America . Edipucrs, Porto Alegre 2003, ISBN 85-7430-361-5 , pp. 268-269 .
- ^ Tim M. Berra: Freshwater Fish Distribution . The University of Chicago Press, Chicago 2007, ISBN 978-0-226-04442-2 , pp. 218-219 .
- ^ Joseph S. Nelson: Fishes of the world . 4th edition. John Wiley & Sons, Hoboken 2006, ISBN 978-0-471-25031-9 , pp. 168 .
Web links
- Nematogenys inermis on Fishbase.org (English)
- Nematogenys inermis inthe IUCN Red List of Threatened Species 2013.2. Listed by: World Conservation Monitoring Center, 1996. Retrieved January 10, 2014.