| Bifidaria Sterki, 1891 |
| Bifidaria bilamellata Sterki & Clapp, 1909 |
| Bifidaria contracta (Say, 1822) |
| Bifidaria dalliana Sterki, 1898 |
| Bifidaria procera (Gould, 1840) |
| Bifidaria procera subsp. cristata Pilsbry & Vanatta, 1900 |
| Bifidaria prototypus Pilsbry, 1899 |
| Bifidaria riograndensis Pilsbry & Vanatta, 1900 |
| Bifidaria tuba Pilsbry & Ferriss, 1906 |
| Bifidaria tuba subsp. intuscostata Clapp, 1908 |
| Chaenaxis Pilsbry & Ferriss, 1906 |
| Chaenaxis intuscostata (Clapp, 1908) |
| Chaenaxis intuscostata f. brevicostata Pilsbry, 1916 |
| Chaenaxis sonorensis Pilsbry, 1953 |
| Chaenaxis tuba (Pilsbry & Ferriss, 1906) |
| Eubifidaria Sterki, 1893 |
| Gastrocopta Wollaston, 1878 |
| Gastrocopta (Albinula) Sterki, 1892 |
| Gastrocopta (Albinula) contracta (Say, 1822) |
| Gastrocopta (Albinula) contracta subsp. contracta (Say, 1822) |