Sand knife eels

from Wikipedia, the free encyclopedia
Sand knife eels
Gymnorhamphichthys sp.

Gymnorhamphichthys sp.

Overcohort : Clupeocephala
Cohort : Otomorpha
Sub-cohort : Ostariophysi
Order : New World Knifefish (Gymnotiformes)
Family : Sand knife eels
Scientific name
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 .


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


Web links

Commons : Rhamphichthyidae  - collection of images, videos and audio files