Acervochalina loosanoffi (Hartmann, 1958) accepted as Chalinula loosanoffi (Hartman, 1958) (additional source)
Acrosiphonia centralis (Lyngbye) Kjellman, 1893 accepted as Acrosiphonia arcta (Dillwyn) Gain, 1912 (basis of record)
Acrosiphonia sonderi (Kützing) Kornmann, 1962 (additional source)
Amphilectus fucorum (Esper, 1794) (additional source)
Angulus donacinus (Linnaeus, 1758) accepted as Moerella donacina (Linnaeus, 1758) (basis of record)
Angulus donacinus (Linnaeus, 1758) accepted as Moerella donacina (Linnaeus, 1758) (source of synonymy)
Arthrospira Sitzenberger ex Gomont, 1892 (additional source)
Blidingia Kylin, 1947 (additional source)
Caulleriella bioculata parva Gillandt, 1979 accepted as Caulleriella parva Gillandt, 1979 (additional source)
Chaetomorpha tortuosa (Dillwyn) Kleen, 1874 (basis of record)
Cochlodesma (Bontaea) T. Brown, 1844 accepted as Cochlodesma Couthouy, 1839 (basis of record)
Cyprina Lamarck, 1818 accepted as Arctica Schumacher, 1817 (source of synonymy)
Cyprina Lamarck, 1818 accepted as Arctica Schumacher, 1817 (basis of record)
Cyprina islandica (Linnaeus, 1767) accepted as Arctica islandica (Linnaeus, 1767) (source of synonymy)
Cyprina islandica (Linnaeus, 1767) accepted as Arctica islandica (Linnaeus, 1767) (basis of record)
Eteone (Mysta) barbata (Malmgren, 1865) accepted as Eteone barbata (Malmgren, 1865) accepted as Mysta barbata Malmgren, 1865 (basis of record)
Gastrosaccus spinifer (Goës, 1864) (redescription)
Halichondria coalita (sensu Lamarck, 1814) represented as Halichondria (Halichondria) bowerbanki Burton, 1930 (additional source)
Helcion pellucidum (Linnaeus, 1758) accepted as Patella pellucida Linnaeus, 1758 (basis of record)
Hermaea dendritica (Alder & Hancock, 1843) accepted as Placida dendritica (Alder & Hancock, 1843) (basis of record)
Janua (Dexiospira) pagenstecheri (Quatrefages, 1866) accepted as Janua heterostropha (Montagu, 1803) (basis of record)
Leucandra fistulosa (Johnston, 1842) (additional source)
Litosiphon filiformis (Reinke) Batters, 1902 accepted as Pogotrichum filiforme Reinke, 1892 (basis of record)
Littorina saxatilis var. rudis (Maton, 1797) accepted as Littorina saxatilis (Olivi, 1792) (basis of record)
Mysis relicta Lovén, 1862 (taxonomy source)
Partulida spiralis (Montagu, 1803) accepted as Spiralinella spiralis (Montagu, 1803) accepted as Spiralina spiralis (Montagu, 1803) (basis of record)
Pectinaria (Amphictene) auricoma (O.F. Müller, 1776) represented as Amphictene auricoma (O.F. Müller, 1776) (additional source)
Phyllodoce (Anaitides) groenlandica Örsted, 1842 represented as Phyllodoce groenlandica Örsted, 1842 (basis of record)
Phyllodoce (Anaitides) lineata (Claparède, 1870) represented as Phyllodoce lineata (Claparède, 1870) (basis of record)
Phyllodoce (Anaitides) maculata (Linnaeus, 1767) represented as Phyllodoce maculata (Linnaeus, 1767) (basis of record)
Phyllodoce (Anaitides) mucosa Örsted, 1843 represented as Phyllodoce mucosa Örsted, 1843 (basis of record)
Phyllodoce (Anaitides) rosea (McIntosh, 1877) represented as Phyllodoce rosea (McIntosh, 1877) (basis of record)
Phymatolithon polymorphum Foslie, 1898 accepted as Phymatolithon calcareum (Pallas) W.H.Adey & D.L.McKibbin ex Woelkering & L.M.Irvine, 1986 (basis of record)
Polysiphonia violacea (Roth) Sprengel, 1827 accepted as Vertebrata fucoides (Hudson) Kuntze, 1891 (basis of record)
Praunus neglectus (G.O. Sars, 1869) (taxonomy source)
Pusillina parva (da Costa, 1778) accepted as Rissoa parva (da Costa, 1778) (basis of record)
Rhodochorton floridulum (Dillwyn) Nägeli, 1862 accepted as Rhodothamniella floridula (Dillwyn) Feldmann, 1978 (basis of record)
Schistomysis kervillei (G.O. Sars, 1885) (taxonomy source)
Schistomysis spiritus (Norman, 1860) (taxonomy source)
Scypha coronata (Ellis & Solander, 1786) accepted as Sycon ciliatum (Fabricius, 1780) (additional source)
Stylochoplana agilis Lang, 1884 accepted as Comoplana agilis (Lang, 1884) (basis of record)
Sycon coronatum (Ellis & Solander, 1786) accepted as Sycon ciliatum (Fabricius, 1780) (source of synonymy)
Typosyllis hyalina (Grube, 1863) accepted as Syllis hyalina Grube, 1863 (additional source)

 Synonymy

 for Patina pellucida (Linnaeus, 1758)

Treated as a synonym of Helcion pellucidum (Linnaeus, 1758). [details]