Ianira breviremis Sars, 1883 – synonym of Janiropsis breviremis
Ianira maculosa Leach, 1814 – synonym of Janira maculosa
Ianiropsis breviremis Sars, 1897 – synonym of Janiropsis breviremis
Idotaega longicauda Lockington, 1877 – synonym of Saduria entomon
Idotea angusta Sars, 1899 – synonym of Idotea chelipes
Idotea aquatica Fabicius, 1798 – synonym of Asellus aquaticus
Idotea balthica Sars, 1897 – synonym of Idotea baltica
Idotea cretaria Dahl, 1916 – synonym of Idotea granulosa
Idotea phosphorea Hoek, 1889 – synonym of Idotea chelipes
Idotea sarsi Collinge, 1917 – synonym of Idotea baltica
Idothea aquatica Latreille – synonym of Asellus aquaticus
Idothea irrorata Harger – synonym of Idotea baltica
Idothea marina Miers – synonym of Idotea baltica
Idothea tricuspidata Desmarest, 1823 – synonym of Idotea baltica
Idothea viridis Sars, 1897 – synonym of Idotea chelipes
Ilyobates bartonensis Brady, 1868 – synonym of Krithe praetexta
Ilyobates praetexta Sars, 1866 – synonym of Krithe praetexta
Inachus araneus Fabricius, 1798 – synonym of Hyas araneus
Inachus dorhynchus Leach, 1814 – synonym of Inachus phalangium
Inachus dorsettensis Leach, 1815 – synonym of Inachus dorsettensis
Inachus leptochirus Leach, 1817 – synonym of Inachus leptochirus
Inachus scorpio Fabricius, 1798 – synonym of Inachus dorsettensis
Ischyrocerus minutus Liljeborg, 1855 – synonym of Ischyrocerus anguipes