| Leptoninae Gray, 1847 |
| Montacuta Turton, 1822 |
| Montacuta elliptica P. P. Carpenter, 1857 |
| Montacuta floridana Dall, 1899 |
| Montacuta subquadrata P. P. Carpenter, 1857 |
| Montacutinae Clark, 1855 |
| Mysella Angas, 1877 |
| Mysella pedroana Dall, 1899 |
| Mysella planulata (Stimpson, 1851) |
| Neaeromya Gabb, 1872 |
| Neaeromya californica (Dall, 1899) |
| Neaeromya chacei (Dall, 1916) |
| Neaeromya floridana (Dall, 1899) |
| Neaeromya jipijapa (Olsson, 1961) |
| Neaeromya margarita (Olsson, 1961) |
| Neaeromya obliqua (Harry, 1969) |
| Orobitella Dall, 1900 |
| Orobitella floridana (Dall, 1899) |
| Orobitella jipijapa Olsson, 1961 |
| Orobitella margarita Olsson, 1961 |