Callianassa laticauda Otto – synonym of Callianassa tyrrhena
Calliope grandoculis Bate, 1862 – synonym of Calliopius laeviusculus
Calliope laeviuscula Bate, 1862 – synonym of Calliopius laeviusculus
Calliopius crenulatus Chevreux and Fage, 1925 – synonym of Calliopius laeviusculus
Calliopius norvegicus Boeck, 1871 – synonym of Apherusa jurinei
Calliopius rathkei Sars, 1893 – synonym of Calliopius laeviusculus
Callisoma crenata Bate and Westwood, 1861 – synonym of Scopelocheirus hopei
Callisoma hopei Costa, 1851 – synonym of Scopelocheirus hopei
Callisoma kroyeri Sars, 1890 – synonym of Scopelocheirus hopei
Cancer (Astacus) scorpioides Montagu, 1804 – synonym of Bodotria scorpioides
Cancer (Gammarellus) linearis Herbst, 1793 – synonym of Caprella linearis
Cancer (Gammarellus) ventricosus Herbst, 1793 – synonym of Phtisica marina
Cancer (Gammarus) falcatus Montagu, 1808 – synonym of Jassa falcata
Cancer (Gammarus) monoculoides Montagu, 1815 – synonym of Stenothoe monoculoides
Cancer (Gammarus) obtusatus Montagu, 1813 – synonym of Abludomelita obtusata
Cancer (Gammarus) saltator Montagu, 1808 – synonym of Talitrus saltator
Cancer (Gammarus) talpa Montagu, 1808 – synonym of Apseudes talpa
Cancer (Leptomera) pedata Latreille, 1836 – synonym of Phtisica marina
Cancer (Leptomera) rubra Latreille, 1836 – synonym of Phtisica marina
Cancer angulata Pennant, 1777 – synonym of Goneplax rhomboides
Cancer araneus Linnaeus, 1758 – synonym of Hyas araneus
Cancer aspera Pennant, 1777 – synonym of Eurynome aspera
Cancer bufo Herbst, 1788 – synonym of Hyas araneus
Cancer caputmortuum Linnaeus, 1767 – synonym of Dromia personata
Cancer cassivelaunus Pennant, 1777 – synonym of Corystes cassivelaunus
Cancer corrugatus Pennant, 1777 – synonym of Liocarcinus corrugatus
Cancer crangon Linnaeus, 1758 – synonym of Crangon crangon
Cancer denticulatus Montagu, 1808 – synonym of Pirimela denticulata
Cancer depurator Linnaeus, 1758 – synonym of Liocarcinus depurator
Cancer depurator Pennant, 1777 – synonym of Liocarcinus holsatus
Cancer dorsettensis Pennant, 1777 – synonym of Inachus dorsettensis
Cancer dorsettensis Pennant, 1777 – synonym of Inachus leptochirus
Cancer fimbriatus Olivi, 1792 – synonym of Cancer pagurus
Cancer flexuosus Müller, 1776 – synonym of Praunus flexuosus
Cancer gammarus pedatus Montagu, 1915 – synonym of Phtisica marina
Cancer hirtellus Linnaeus, 1761 – synonym of Pilumnus hirtellus
Cancer latipes Pennant, 1777 – synonym of Portumnus latipes
Cancer linearis Linnaeus, 1767 – synonym of Caprella linearis
Cancer linnearis.-Linnaeus, 1800 – synonym of Caprella linearis
Cancer locusta Linnaeus, 1758 – synonym of Gammarus locusta
Cancer luederwaldti Rathbun, 1930 – synonym of Cancer pagurus
Cancer maenas Linnaeus, 1758 – synonym of Carcinus maenas
Cancer maxillaris Montagu, 1804 – synonym of Gnathia maxillaris
Cancer minutus Linnaeus, 1758 – synonym of Planes minutus
Cancer personatus Herbst, 1785 (not Cancer personatus Linnaeus, 1758) – synonym of Corystes cassivelaunus
Cancer personatus Linnaeus, 1758 – synonym of Dromia personata
Cancer phalangium Fabricius, 1775 – synonym of Inachus phalangium
Cancer pinnotheres Linnaeus, 1758 – synonym of Pinnotheres pinnotheres
Cancer pisum Linnaeus, 1767 – synonym of Pinnotheres pisum
Cancer puber Linnaeus, 1767 – synonym of Necora puber
Cancer rhomboides Linnaeus, 1758 – synonym of Goneplax rhomboides
Cancer rostratus Linnaeus, 1761 – synonym of Macropodia rostrata
Cancer rotundatus Olivi, 1792 – synonym of Atelecyclus rotundatus
Cancer rubricatus Montagu, 1808 – synonym of Ampithoe rubricata
Cancer scorpio Fabricius, 1779 – synonym of Inachus dorsettensis
Cancer scorpioides Montagu, 1804 – synonym of Bodotria arenosa
Cancer spinus J. Sowerby, 1805 – synonym of Spirontocaris spinus
Cancer squilla Linnaeus, 1758 – synonym of Palaemon adspersus
Cancer squinado Herbst, 1788 – synonym of Maja squinado
Cancer tuberosus Pennant, 1777 – synonym of Ebalia tuberosa
Cancer tumefactus Montagu, 1808 – synonym of Ebalia tumefacta
Cancer velutinus Pennant, 1777 – synonym of Necora puber
Candona torosa Jones, 1850 – synonym of Cyprideis torosa
Caprella acuminifera @(@not Leach@)@ Rathke, 1843 – synonym of Caprella linearis
Caprella aequilibra Bate, 1862 – synonym of Caprella equilibra
Caprella aequilibra Bate, 1878 – synonym of Caprella equilibra
Caprella caudata Thomson, 1878 – synonym of Caprella equilibra
Caprella cercopoides White, 1852 – synonym of Caprella septentrionalis
Caprella esmarckii Boeck, 1861 – synonym of Caprella equilibra
Caprella hystrix (Krøyer) – synonym of Caprella acanthifera
Caprella hystrix @(@not Krøyer@)@ Bate and Westwood, 1868 – synonym of Caprella septentrionalis
Caprella hystryx Bate, 1878 – synonym of Caprella septentrionalis
Caprella januarii Kr6yer, 1842-43 – synonym of Caprella equilibra
Caprella laevis Goodsir, 1842 – synonym of Caprella linearis
Caprella laticornis Boeck, 1861 – synonym of Caprella equilibra
Caprella linearis @(@not Linnaeus@)@ Barrois, 1888 – synonym of Caprella equilibra
Caprella linearis f. distalis Mayer, 1903 – synonym of Caprella linearis
Caprella linearis f. gullmarensis Mayer, 1903 – synonym of Caprella linearis
Caprella lobata Bate, 1856 – synonym of Caprella linearis
Caprella longicornis Boeck, 1871 – synonym of Caprella septentrionalis
Caprella lovéni Boeck, 1871 – synonym of Caprella septentrionalis
Caprella lovéni Stephensen, 1940 – synonym of Caprella septentrionalis
Caprella megacephala A. Edwards, 1868 – synonym of Caprella equilibra
Caprella mendax Mayer, 1903 – synonym of Caprella equilibra
Caprella monacantha Heller, 1866 – synonym of Caprella equilibra
Caprella monocera G. Sars, 1895 – synonym of Caprella septentrionalis
Caprella obesa @(@not van Beneden@)@ Haswell, 1880 – synonym of Caprella equilibra
Caprella obtusa Heller, 1886 – synonym of Caprella equilibra
Caprella phasma @(@not Montagu@)@ Rathke, 1843 – synonym of Caprella linearis
Caprella punctata @(@not Risso@)@ Boeck, 1861 – synonym of Caprella septentrionalis
Caprella punctata Risso, 1816 – synonym of Caprella linearis
Caprella robusta Stimpson, 1854 – synonym of Caprella septentrionalis
Caprella scolopendroides @(@not Lamarck@)@ Rathke, 1843 – synonym of Caprella linearis
Caprella septentrionalis f. longicornis Mayer, 1890 – synonym of Caprella septentrionalis
Caprella septentrionalis f. lovéni Oldevig, 1933 – synonym of Caprella septentrionalis
Caprella septentrionalis f. monocera Oldevig, 1933 – synonym of Caprella septentrionalis
Caprella septentrionalis f. nodigera Mayer, 1890 – synonym of Caprella septentrionalis
Caprella septentrionalis f. parva Mayer, 1890 – synonym of Caprella septentrionalis
Caprella septentrionalis f. polyceros Mayer, 1890 – synonym of Caprella septentrionalis
Caprella septentrionalis f. punctata Oldevig, 1933 – synonym of Caprella septentrionalis
Caprella septentrionalis f. spinigera Hansen, 1895 – synonym of Caprella septentrionalis
Caprella septentrionalis f. typica Mayer, 1890 – synonym of Caprella septentrionalis
Caprella septentrionalis longicornis M. Rathbun, 1905 – synonym of Caprella septentrionalis
Caprella septentrionalis lovéni Stephensen, 1929 – synonym of Caprella septentrionalis
Caprella septentrionalis monocera Stephensen, 1929 – synonym of Caprella septentrionalis
Caprella septentrionalis polyceros M. Rathbun, 1905 – synonym of Caprella septentrionalis
Caprella septentrionalis punctata Stephensen, 1929 – synonym of Caprella septentrionalis
Caprella septentrionalis stimpsoni M. Rathbun, 1905 – synonym of Caprella septentrionalis
Caprella stimpsoni Bate, 1862 – synonym of Caprella septentrionalis
Caprella ultima Bate, 1862 – synonym of Caprella equilibra
Caprella ventricosa Bosc, 1801-02 – synonym of Phtisica marina
Carcinides maenas Atkins, 1954 – synonym of Carcinus maenas
Carinocythereis antiquata Bonaduce, Ciampo & Masoli, 1976 – synonym of Carinocythereis whitei
Carinocythereis bairdii Uliczny, 1969 – synonym of Carinocythereis whitei
Carinocythereis carinata Carbonel & Moyes, 1971 – synonym of Carinocythereis whitei
Carinocythereis quadridentata Yassini, 1969 – synonym of Celtia quadridentata
Cerapus difformis Bate, 1862 – synonym of Ericthonius difformis
Cerapus hunteri Bate, 1862 – synonym of Ericthonius difformis
Chaetogammarus pirloti Auct. – synonym of Echinogammarus pirloti
Cheirocratus mantis Norman, 1867 – synonym of Cheirocratus assimilis
Cheirocratus sundevallii Stebbing, 1888 – synonym of Cheirocratus sundevallii
Cheirocratus sundewalli Sars, 1894 – synonym of Cheirocratus sundevallii
Coremapus versiculatus Norman, 1905 – synonym of Microdeutopus versiculatus
Corophia bonnellii Milne-Edwards, 1830 – synonym of Corophium bonnellii
Corophium bonelli Crawford, 1937 – synonym of Corophium bonnellii
Corophium crassicorne Gurney, 1904 – synonym of Corophium lacustre
Corophium crassicorne Walker, 1904 – synonym of Corophium acherusicum
Corophium grossipes Gurney, 1904 (part) – synonym of Corophium multisetosum
Corophium grossipes Templeton, 1836 – synonym of Corophium volutator
Corophium longicorne White, 1847 – synonym of Corophium volutator
Corophium sextoni Crawford, 1937 – synonym of Corophium sextonae
Corophium tenuicorne Norman, 1869 – synonym of Corophium affine
Corophium volutator Crawford, 1937 – synonym of Corophium multisetosum
Corystes dentatus: Latreille, 1801 – synonym of Corystes cassivelaunus
Crangon nanus Krøyer, 1842 – synonym of Pontophilus bispinosus
Crangon spinosus Leach, 1815 – synonym of Pontophilus spinosus
Crangon trispinosus – synonym of Pontophilus trispinosus
Cratophium validum Dana, 1852b – synonym of Jassa falcata
Cressa schoidtei Boeck, 1871 – synonym of Cressa dubia
Ctenomysis alata Norman, 1862 – synonym of Lophogaster typicus
Cuma cornuta Boeck, 1863 – synonym of Diastylis cornuta
Cuma edwardsii Goodsir, 1843 – synonym of Bodotria scorpioides
Cuma nasica Krøyer, 1841 – synonym of Leucon nasica
Cuma resima Krøyer, 1846 – synonym of Brachydiastylis resima
Cuma rubicuna Lilljeborg, 1855 – synonym of Campylaspis rubicunda
Cuma scorpioides (Montagu, 1804) – synonym of Bodotria arenosa
Cuma trispinosa Goodsir, 1843 – synonym of Iphinoe trispinosa
Cymothoa aquatica Fabricius, 1793 – synonym of Asellus aquaticus
Cymothoa lignorum Rathke, 1799 – synonym of Limnoria lignorum
Cymothoa oceanica Fabricius – synonym of Ligia oceanica
Cynthia flemingii Goodsir, 1842 – synonym of Siriella armata
Cynthilia armata (Milne-Edwards, 1837) – synonym of Siriella armata
Cynthilia clausii (G.O. Sars, 1876) – synonym of Siriella clausii
Cynthilia flemengii (Goodsir, 1842) – synonym of Siriella armata
Cynthilia frontalis (Norman, 1886) – synonym of Siriella armata
Cynthilia jaltensis (Czerniavsky, 1868) – synonym of Siriella jaltensis
Cynthis armata Milne-Edwards, 1837 – synonym of Siriella armata
Cyprideis bairdii Sars, 1866 – synonym of Sarsicytheridea bradii
Cyprideis proxima Sars, 1866 – synonym of Sarsicytheridea punctillata
Cypris serrulata Sars, 1863 – synonym of Pontocypris mytiloides
Cyrianassa elegans Norman (male) – synonym of Hemilamprops rosea
Cyrtophium darwinii Bate, 1857 – synonym of Podocerus variegatus
Cythere (Bairdia) mytiloides Norman, 1862 – synonym of Pontocypris mytiloides
Cythere alba Baird, 1835 – synonym of Heterocythereis albomaculata
Cythere albo-maculata Baird, 1838 – synonym of Heterocythereis albomaculata
Cythere avena Norman, 1865 – synonym of Pontocypris mytiloides
Cythere bradii Norman, 1865 – synonym of Sarsicytheridea bradii
Cythere castanea Sars, 1866 – synonym of Leptocythere castanea
Cythere concinna Jones, 1857 – synonym of Elofsonella concinna
Cythere contorta Norman, 1861 – synonym of Sclerochilus contortus
Cythere debilis; Norman, 1865 – synonym of Sarsicytheridea bradii
Cythere dunelmensis Brady, 1868 – synonym of Acanthocythereis dunelmensis
Cythere Jonesii Brady, Crosskey & Robertson, 1874 – synonym of Pterygocythereis jonesii
Cythere latissima Norman, 1865 – synonym of Cytheropteron latissimum
Cythere minna Baird, 1850 – synonym of Macrocypris minna
Cythere pellucida; Brady & Norman, 1889 – synonym of Leptocythere castanea
Cythere quadridentata Baird, 1850 – synonym of Celtia quadridentata
Cythere reniformis Baird, 1835 – synonym of Cythere lutea
Cythere simplex Norman, 1865 – synonym of Jonesia acuminata
Cythere variabilis Baird, 1835 – synonym of Paradoxostoma variabile
Cythere whiteii Brady, 1868 – synonym of Carinocythereis whitei
Cythereis (Heterocythereis) albomaculata Elofson, 1941 – synonym of Heterocythereis albomaculata
Cythereis (Paracythereis) concinna Elofson, 1941 – synonym of Elofsonella concinna
Cythereis (Pterygocythereis) jonesi Elofson, 1941 – synonym of Pterygocythereis jonesii
Cythereis aspera Brady, 1865 – synonym of Carinocythereis whitei
Cythereis clavata Sars, 1866 – synonym of Elofsonella concinna
Cythereis dunelmensis Elofson, 1941 – synonym of Acanthocythereis dunelmensis
Cythereis dunelmensis Norman, 1865 – synonym of Acanthocythereis dunelmensis
Cythereis Jonesii Baird, 1850 – synonym of Pterygocythereis jonesii
Cythereis subcoronata Speyer – synonym of Pterygocythereis jonesii
Cythereis whitei Baird, 1850 – synonym of Carinocythereis whitei
Cytheridea littoralis Brady, 1868 – synonym of Cyprideis torosa
Cytheridea papillosa Brady, 1866 – synonym of Sarsicytheridea bradii
Cytheridea pedaschenkoi Von Daday, 1909 – synonym of Cyprideis torosa
Cytheridea punctillata Brady, 1865 – synonym of Sarsicytheridea punctillata
Cytheridea torosa var. teres var. nov. Brady & Robertson, 1870 – synonym of Cyprideis torosa
Cytheropsis argus Sars, 1866 – synonym of Eucythere argus
Cytheropteron convexum Sars, 1866 – synonym of Cytheropteron latissimum