Rhamphichthyidae

Sand knifefish are freshwater electric fish of the family Rhamphichthyidae, from freshwater habitats in South America.

species of fish

Rhamphichthys is a genus of freshwater ray-finned fish belonging to the family Rhamphichthyidae, the sand knifefishes. These fish are eel shaped (or anguiform) with a distinct beak like snout which gave them their name. Like most other knifefish Rhamphichthys species have electrical organs that help them live in the murky waters of South America.

species of fish

Gymnorhamphichthys is a genus of South American sand knifefishes found in the Amazon, Araguaia, Orinoco and Río de la Plata basins, as well as rivers in the Guianas. They inhabit both small streams and large rivers, but usually over a sandy bottom. During the night they swim head-down over the sandy bottom to locate small invertebrate prey like insect larvae and during the day they rest buried under the sand.

Steatogenys is a genus of freshwater ray-finned fishes belonging to the family Rhamphichthyidae, the sand kinifefishes. The fishes in this genus are found in the Amazon, Orinoco and Essequibo river basins in tropical South America. The widespread and common S. elegans is found in a wide range of habitats, from the shallow essentially static waters such as floodplain lakes to fast-flowing rivers as deep as . The two remaining species are less common and widespread, with S. duidae found mainly in small streams running through terra firme forests (forest that does not flood, unlike várzea) and S.