| Scientific Name | Author | English Name |
|---|---|---|
| Gymnorhamphichthys bogardusae | Lundberg, 2005 | |
| Gymnorhamphichthys britskii | Carvalho, Ramos & Albert, 2011 | Drop Knifefish |
| Gymnorhamphichthys hypostomus | Ellis, 1912 | Morse Knifefish |
| Gymnorhamphichthys petiti | Géry & Vu, 1964 | |
| Gymnorhamphichthys rondoni | (Miranda Ribeiro, 1920) | Mousetail knifefish |
| Gymnorhamphichthys rosamariae | Schwassmann, 1989 | Sand knifefish |
| Iracema caiana | Triques, 1996 | Dashed knifefish |
| Rhamphichthys apurensis | (Fernández-Yépez, 1968) | Longnose knifefish |
| Rhamphichthys atlanticus | Triques, 1999 | Atlantic knifefish |
| Rhamphichthys drepanium | Triques, 1999 | Bow knifefish |
| Rhamphichthys hahni | (Meinken, 1937) | Roundnose knifefish |
| Rhamphichthys heleios | Carvalho & Albert, 2015 | Marsh knifefish |
| Rhamphichthys lineatus | Castelnau, 1855 | Line knifefish |
| Rhamphichthys longior | Triques, 1999 | Trombetas knifefish |
| Rhamphichthys marmoratus | Castelnau, 1855 | Marble knifefish |
| Rhamphichthys pantherinus | Castelnau, 1855 | Panther knifefish |
| Rhamphichthys rostratus | (Linnaeus, 1766) | Trompet knifefish |