| 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 |
| Pseudobranchiomma perkinsi P. Knight-Jones & Giangrande, 2003 |
| Pseudopotamilla Bush, 1905 |
| Pseudopotamilla anoculata Moore, 1905 |
| Pseudopotamilla debilis Bush, 1905 |
| Pseudopotamilla fitzhughi Tovar-Hernández & Salazar-Vallejo, 2006 |
| Pseudopotamilla intermedia Moore, 1905 |
| Pseudopotamilla occelata Moore, 1905 |