Sand knife eels
| Sand knife eels | ||||||||||||
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Gymnorhamphichthys sp. |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Rhamphichthyidae | ||||||||||||
| Regan , 1911 |
The sand knife eels or tube-mouth knife fish (Rhamphichthyidae Gr .: rhamphos = beak, ichthys = fish) live in fresh waters in South America. The fish are nocturnal and spend the day buried in the sand. They do brood care .
features
The fish have a laterally flattened, elongated body tapering to the tip of the tail. In front of the tail they have 12 to 26 vertebrae . They are 15 centimeters to one meter long. The anal fin is extremely elongated as the main driving organ and begins even before the pectoral fins . The dorsal fin , the pelvic fins , a caudal fin and the pelvic girdle are missing. In order to orientate themselves in their murky home waters, the animals have electrical organs. The muzzle is tubular and elongated, the nostrils are close together, the lower jaw is toothless. Your ethmoid bone , a bone in the skull, is very long (1/3 the length of the skull) and narrow.
Genera and species
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Gymnorhamphichthys Ellis in Eigenmann , 1912
- Gymnorhamphichthys bogardusi Lundberg, 2005
- Gymnorhamphichthys britskii Carvalho, Ramos & Albert, 2011
- Gymnorhamphichthys hypostomus Ellis in Eigenmann, 1912
- Gymnorhamphichthys petiti Géry & Vu-Tân-Tuê , 1964
- Gymnorhamphichthys rondoni ( Miranda Ribeiro , 1920)
- Gymnorhamphichthys rosamariae Schwassmann, 1989
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Iracema Triques , 1996
- Iracema caiana Triques, 1996
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Rhamphichthys Müller & Troschel , 1849
- Rhamphichthys apurensis ( Fernández-Yépez , 1968)
- Rhamphichthys atlanticus Triques, 1999
- Rhamphichthys drepanium Triques, 1999
- Rhamphichthys hahni ( Meinken , 1937)
- Rhamphichthys heleios Carvalho & Albert, 2015
- Rhamphichthys lineatus Castelnau , 1855
- Rhamphichthys longior Triques, 1999
- Rhamphichthys marmoratus Castelnau, 1855
- Rhamphichthys rostratus ( Linnaeus , 1766)
literature
- Joseph S. Nelson : Fishes of the World. 4th edition. John Wiley & Sons, New York NY 2006, ISBN 0-471-25031-7 .
Web links
- Sand knife eels on Fishbase.org (English)