| Potamilla Malmgren, 1866 |
| Potamilla anophthalma Hartmann-Schröder, 1960 |
| Potamilla brevibranchiata (Moore, 1905) |
| Potamilla colorata Chamberlin, 1919 |
| Potamilla floridana Augener, 1922 |
| Potamilla fonticula Hoagland, 1919 |
| Potamilla minuta Treadwell, 1941 |
| Potamilla neglecta (Sars, 1851) |
| Potamilla reniformis Fauvel, 1927 |
| Potamilla torelli Malmgren, 1865 |
| Potamis Ehlers, 1887 |
| Potamis spathiferus Ehlers, 1887 |
| Potaspina Hartman, 1969 |
| Potaspina pacifica Hartman, 1969 |
| Protulides Webster, 1884 |
| Protulides elegans Webster, 1884 |
| Pseubranchioma M.L. Jones, 1962 |
| Pseubranchioma schizogenia Tovar-Hernández, 2014 |
| Pseudobranchiomma Jones, 1962 |
| Pseudobranchiomma emersoni Jones, 1962 |