Schistomysis spiritus (Norman, 1860) – synonym of Schistomysis spiritus
Sclerochilus bradyi Rudjakov, 1962 – synonym of Sclerochilus rudjakovi
Sclerochilus contortus Elofson, 1941 – synonym of Sclerochilus rudjakovi
Scopelocheirus crenatus Bate, 1857 – synonym of Scopelocheirus hopei
Siphonoecetes colletti Boeck, 1871 – synonym of Siphonoecetes kroyeranus
Siphonoecetes dellavallei Hamond, 1965 – synonym of Siphonoecetes kroyeranus
Siphonoecetes whitei Bate, 1862 – synonym of Siphonoecetes kroyeranus
Siphonoecetus crassicornis Bate, 1856 – synonym of Cerapus crassicornis
Siriella aculeata Edward, 1876 – synonym of Siriella jaltensis
Siriella armata (Milne-Edwards, 1837) – synonym of Siriella armata
Siriella clausi (G.O. Sars, 1876) – synonym of Siriella clausii
Siriella clausii G.O. Sars, 1877 – synonym of Siriella jaltensis
Siriella crassipes G.O. Sars, 1877 – synonym of Siriella jaltensis
Siriella flemingi (Goodsir, 1842) – synonym of Siriella armata
Siriella frontalis (Norman, 1886) – synonym of Siriella armata
Siriella intermedia Gourret, 1888 – synonym of Siriella armata
Siriella messinensis Czerniavsky, 1883 – synonym of Siriella clausii
Siriellides clausi (G.O. Sars, 1876) – synonym of Siriella clausii
Siriellides crassipes (G.O. Sars, 1977) – synonym of Siriella jaltensis
Siriellides paulsoni Czerniavsky, 1882 – synonym of Siriella jaltensis
Slabberina agata Van Beneden, 1861 – synonym of Eurydice pulchra
Slabberina agilis G.O. Sars – synonym of Eurydice pulchra
Slabberina gracilis Bovallius – synonym of Eurydice pulchra
Sphaeroma bolivarii De Buen, 1887 – synonym of Lekanesphaera hookeri
Sphaeroma fossarum Von Martens, 1857 – synonym of Lekanesphaera hookeri
Sphaeroma hookeri Bate & Westwood, 1868 – synonym of Lekanesphaera hookeri
Sphaeroma hookeri Leach, 1814 – synonym of Lekanesphaera hookeri
Sphaeroma rugicauda Apstein, 1908 – synonym of Lekanesphaera hookeri
Sphaeroma rugicauda Leach, 1814 – synonym of Lekanesphaera rugicauda
Spirontocaris securifrons (Norman, 1862) – synonym of Spirontocaris lilljeborgi
Spiropagurus chiroacanthus Henderson, 1886 – synonym of Anapagurus chiroacanthus
Spiropagurus ferrugineus Henderson, 1886 – synonym of Anapagurus chiroacanthus
Spiropagurus hyndmanni Henderson, 1886 – synonym of Anapagurus hyndmanni
Squilla acaudata pedibus quatuordecim Cronovius, 1760 – synonym of Phtisica marina
Squilla asellus De Geer, 1778 – synonym of Asellus aquaticus
Squilla desmaresti Giesbrecht, 1910 – synonym of Meiosquilla desmaresti
Squilla lobata @(@not Müller@)@ O. Fabricius, 1780 – synonym of Caprella septentrionalis
Squilla lobata Mülller, 1776 – synonym of Caprella linearis
Squilla quadrilobata Abildgaard, 1788 – synonym of Caprella linearis
Squilla ventricosa Müller, 1776 – synonym of Phtisica marina
Stegocephaloides christianiensis
Stegocephalus christianiensis Boeck, 1871 – synonym of Stegocephaloides christianiensis
Stenorhynchus aegyptius Carrington & Lovett, 1881 – synonym of Macropodia deflexa
Stenorhynchus inermis Heller, 1856 – synonym of Macropodia rostrata
Stenorhynchus rostratus White, 1850 – synonym of Macropodia rostrata
Stenorhynchus tenuirostris Bell, 1844 – synonym of Macropodia tenuirostris
Stenosoma irrorata Say, 1818 – synonym of Idotea baltica
Steurgarnaal met trompetwijse oogen Slabber, 1778 – synonym of Mesopodopsis slabberi
Sthenothoides latipes Chevreux and Fage, 1925 – synonym of Stenula rubrovittata
Stylocheiron mastigophorum Chun, 1887 – synonym of Stylocheiron longicorne
Sulcator arenarius Bate, 1854 – synonym of Haustorius arenarius
Sunamphithoe conformata: Bate, 1862 – synonym of Sunamphitoe pelagica
Sunamphithoe hamulus Bate, 1857 – synonym of Ampithoe gammaroides
Sunamphithoe longicornis Boeck. 1871 – synonym of Ampithoe gammaroides
Sunamphitoe conformatus Bate, 1856 – synonym of Sunamphitoe pelagica
Synchelidium brevicarpum Sars, 1892 – synonym of Synchelidium haplocheles
Synchelidium haplocheles Stebbing, 1906 – synonym of Synchelidium haplocheles
Synmisis neglecta (G.O. Sars, 1869) – synonym of Praunus neglectus
Synmysis ornata (G.O. Sars, 1864) – synonym of Schistomysis ornata
Synmysis parkeri Zimmer, 1915 – synonym of Schistomysis parkeri
Synmysis spiritus (Norman, 1860) – synonym of Schistomysis spiritus
Syrrhoe hamatipes Norman, 1869 – synonym of Argissa hamatipes