| Nominal Species (n = 43) | Present allocation (n = 40) | Ref. |
|---|---|---|
| Utriculus antarctica Pfeffer, 1886 | Retusa antarctica | 83435 |
| Volvulella aspinosa Dall, 1889 | Volvulella paupercula | 75097 |
| Cylichna caelata Bush, 1885 | Retusa caelata | 83435 |
| Volvulella californica Dall, 1919 | Volvulella californica | 19 |
| Volvulella callicera Dall, 1919 | Volvulella cylindrica | 75097 |
| Cylichna candidula Locard, 1892 | Retusa candidula | 1056 |
| Volvulella catharia Dall, 1919 | Volvulella catharia | 19 |
| Retusa chrysoma Burn, 1974 | Retusa chrysoma | 7727 |
| Cylichnina crebrisculpta Monterosato, 1884 | Cylichnina crebrisculpta | 1056 |
| Cylichna curtulus Dall, 1927 | Pyrunculus curtulus | 83435 |
| Utriculus domita Dall, 1889 | Retusa domita | 83435 |
| Cylichna floridensis Dall, 1927 | Pyrunculus floridensis | 83435 |
| Utriculus frielei Dall, 1881 | Retusa frielei | 83435 |
| Bulla hoernesii Weinkauff, 1866 | Pyrunculus hoernesi | 1056 |
| Cylichna laevisculpta Granata-Grillo, 1877 | Cylichnina laevisculpta | 1056 |
| Cylichna leptoeneilema Brusina, 1866 | Retusa leptoeneilema | 1056 |
| Pyrunculus longiformis Lin & Qi, 1986 | Pyrunculus longiformis | 3477 |
| Bulla mammillata Philippi, 1836 | Retusa mammillata | 1056 |
| Utriculus mayoi Dall, 1889 | Retusa mayoi | 83435 |
| Cylichna medius Dall, 1927 | Pyrunculus medius | 83435 |
| Volvula minuta Bush, 1885 | Volvulella minuta | 83435 |
| Retusa montereyensis Smith & Gordon, 1948 | Retusa montereyensis | 19 |
| Cylichna nitidula Lovén, 1846 | Cylichnina nitidula | 83435 |
| Bulla obtusa Montagu, 1803 | Retusa obtusa | 83435 |
| Cylichna ovata Jeffreys, 1871 | Pyrunculus ovatus | 19 |
| Volvulella panamica Dall, 1919 | Volvulella panamica | 19 |
| Cylichna paupercula Watson, 1883 | Volvulella paupercula | 83435 |
| Retusa paziana Dall, 1919 | Retusa paziana | 867 |
| Bulla pellucida Sars, 1878 | Retusa pellucida | 1056 |
| Retusa pelyx Burn, 1974 | Retusa pelyx | 7727 |
| Volvula persimilis Mörch, 1875 | Volvulella persimilis | 83435 |
| Retusa pertenius Mighels, 1843 | Retusa obtusa | 75097 |
| Utriculus pervia Dall, 1889 | Retusa pervia | 83435 |
| Haminea pusilla Pease, 1860 | Retusa pusilla | 87884 |
| Cylichna rushi Dall, 1927 | Pyrunculus rushi | 83435 |
| Retusa sosa Marcus & Marcus, 1969 | Retusa sosa | 83435 |
| Bulla sulcata d'Orbigny, 1841 | Retusa sulcata | 83435 |
| Retusa tarutana Smythe, 1979 | Retusa tarutana | 3477 |
| Volvulella texasiana Harry, 1967 | Volvulella texasiana | 19 |
| Pyrunculus tokyoensis Habe, 1950 | Pyrunculus tokyoensis | 75927 |
| Retusa turrita Møller, 1842 | Retusa obtusa | 3477 |
| Bulla umbilicata Montagu, 1803 | Retusa umbilicata | 1056 |
| Retusa xystrum Dall, 1919 | Retusa xystrum | 19 |