| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Imparfinis cochabambae (Fowler, 1940) |
South America | 6 | |
| Imparfinis guttatus (Pearson, 1924) |
South America | 12.7 | |
| Imparfinis hasemani Steindachner, 1915 |
South America | 8.1 | |
| Imparfinis hollandi Haseman, 1911 |
South America | 23 | |
| Imparfinis lineatus (Bussing, 1970) |
Central America | 7 | |
| Imparfinis longicauda (Boulenger, 1887) |
South America | 11.7 | |
| Imparfinis microps Eigenmann & Fisher, 1916 |
South America | 6.1 | |
| Imparfinis minutus (Lütken, 1874) |
South America | 12 | |
| Imparfinis mirini Haseman, 1911 |
South America | 8.5 | |
| Imparfinis mishky Almirón, Casciotta, Bechara, Ruíz Díaz, Bruno, D’Ambrosio, Solimano & Soneira, 2007 |
South America | ||
| Imparfinis nemacheir (Eigenmann & Fisher, 1916) |
South America | 9.9 | |
| Imparfinis parvus (Boulenger, 1898) |
South America | 8 | |
| Imparfinis pijpersi (Hoedeman, 1961) |
South America | 9.5 | |
| Imparfinis piperatus Eigenmann & Norris, 1900 |
South America | 3.2 | |
| Imparfinis pristos Mees & Cala, 1989 |
South America | 3.8 | |
| Imparfinis pseudonemacheir Mees & Cala, 1989 |
South America | 4 | |
| Imparfinis schubarti (Gomes, 1956) |
South America | 9.3 | |
| Imparfinis spurrellii (Regan, 1913) |
South America | 6.2 | |
| Imparfinis stictonotus (Fowler, 1940) |
South America | 4.8 | |
| Imparfinis timana Ortega-Lara, Milani, DoNascimiento, Villa-Navarro & Maldonado-Ocampo, 2011 |
South America | 7.67 | |
| Imparfinis usmai Ortega-Lara, Milani, DoNascimiento, Villa-Navarro & Maldonado-Ocampo, 2011 |
South America | 10.25 |