- Idotea balthica (Pallas, 1772)
- Idotea balthica tricuspidata Desmarest, 1823 accepted as Idotea balthica (Pallas, 1772)
- Idotea emarginata (Fabricius, 1793)
- Idotea granulosa Rathke, 1843
- Idotea pelagica Leach, 1816
- Synidotea bicuspida (Owen, 1839)
- Synidotea muricata (Harford, 1877)
- Synidotea nebulosa Benedict, 1897
- Synidotea nodulosa (Krøyer, 1846)