| Isotoma Bourlet, 1839 |
| Isotoma anglicana Lubbock, 1862 |
| Isotoma angularis Axelson, 1905 |
| Isotoma beta Christiansen & Bellinger, 1980 |
| Isotoma caeruleatra Guthrie, 1903 |
| Isotoma communa MacGillivray, 1896 |
| Isotoma ekmani Fjellberg, 1977 |
| Isotoma marissa Folsom, 1937 |
| Isotoma multisetis Carpenter & Phillips, 1922 |
| Isotoma nivalis Carl, 1910 |
| Isotoma notabilis Schäffer, 1896 |
| Isotoma tariva Wray, 1953 |
| Isotoma trispinata MacGillivray, 1896 |
| Isotoma uniens (Christiansen & Bellinger, 1980) |
| Isotoma violacea Tullberg, 1876 |
| Isotoma violacea var. mucronata Axelson, 1900 |
| Isotoma viridis Bourlet, 1839 |
| Isotomidae Schäffer, 1896 |
| Isotomiella Bagnall, 1939 |
| Isotomiella minor (Schäffer, 1896) |