n = 19
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Rhamphichthys apurensis | (Fernández-Yépez, 1968) | Rhamphichthys apurensis | Rhamphichthyidae | Longnose knifefish |
| Rhamphichthys artedi | Kaup, 1856 | Hypopomus artedi | Hypopomidae | |
| Rhamphichthys atlanticus | Triques, 1999 | Rhamphichthys atlanticus | Rhamphichthyidae | Atlantic knifefish |
| Rhamphichthys blochii | Kaup, 1856 | Rhamphichthys rostratus | Rhamphichthyidae | Trompet knifefish |
| Rhamphichthys brevirostris | Steindachner, 1868 | Brachyhypopomus brevirostris | Hypopomidae | Bluntnose knifefish |
| Rhamphichthys cingulatus | Brind, 1935 | Gymnotus coatesi | Gymnotidae | |
| Rhamphichthys drepanium | Triques, 1999 | Rhamphichthys drepanium | Rhamphichthyidae | Bow knifefish |
| Rhamphichthys elegans | Steindachner, 1880 | Steatogenys elegans | Hypopomidae | Barred knifefish |
| Rhamphichthys hahni | (Meinken, 1937) | Rhamphichthys hahni | Rhamphichthyidae | Roundnose knifefish |
| Rhamphichthys heleios | Carvalho & Albert, 2015 | Rhamphichthys heleios | Rhamphichthyidae | Marsh knifefish |
| Rhamphichthys lineatus | Castelnau, 1855 | Rhamphichthys lineatus | Rhamphichthyidae | Line knifefish |
| Rhamphichthys longior | Triques, 1999 | Rhamphichthys longior | Rhamphichthyidae | Trombetas knifefish |
| Rhamphichthys marmoratus | Castelnau, 1855 | Rhamphichthys marmoratus | Rhamphichthyidae | Marble knifefish |
| Rhamphichthys mirabilis | Steindachner, 1880 | Steatogenys elegans | Hypopomidae | Barred knifefish |
| Rhamphichthys mulleri | Kaup, 1856 | Hypopomus artedi | Hypopomidae | |
| Rhamphichthys pantherinus | Castelnau, 1855 | Rhamphichthys pantherinus | Rhamphichthyidae | Panther knifefish |
| Rhamphichthys reinhardti | Kaup, 1856 | Rhamphichthys rostratus | Rhamphichthyidae | Trompet knifefish |
| Rhamphichthys rostratus | (Linnaeus, 1766) | Rhamphichthys rostratus | Rhamphichthyidae | Trompet knifefish |
| Rhamphichthys schneideri | Kaup, 1856 | Rhamphichthys rostratus | Rhamphichthyidae | Trompet knifefish |