Cryptonatica clausa (Broderip & G. B. Sowerby I, 1829) accepted as Cryptonatica affinis (Gmelin, 1791) (basis of record)
Cryptonatica septentrionalis (Møller, 1842) accepted as Cryptonatica affinis (Gmelin, 1791) (basis of record)
Cryptonatica septentrionalis (Møller, 1842) accepted as Cryptonatica affinis (Gmelin, 1791) (source of synonymy)
Cuthona marisalbi Roginskaya, 1963 accepted as Cuthonella concinna (Alder & Hancock, 1843) (source of synonymy)
Cyclopecten imbrifer (Lovén, 1846) accepted as Cyclopecten hoskynsi (Forbes, 1844) (additional source)
Cyrtodaria kurriana Dunker, 1861 (basis of record)
Ganesa laevigata (Friele, 1876) accepted as Skenea trochoides (Friele, 1876) (basis of record)
Ganesa laevigata (Friele, 1876) accepted as Skenea trochoides (Friele, 1876) (source of synonymy)
Leionucula Quenstedt, 1930 † (basis of record)
Leionucula bellotii (A. Adams, 1856) accepted as Ennucula tenuis (Montagu, 1808) (basis of record)
Nuculana lamellosa (Leche, 1883) accepted as Nuculana pernula (O. F. Müller, 1779) (basis of record)
Nuculana lamellosa (Leche, 1883) accepted as Nuculana pernula (O. F. Müller, 1779) (source of synonymy)
Obesotoma gigantea (Mörch, 1869) (basis of record)
Obesotoma starobogatovi Bogdanov, 1990 (basis of record)
Obesotoma tumida (Posselt, 1898) accepted as Granotoma tumida (Posselt, 1898) (basis of record)
Onoba verrilli (Friele, 1886) accepted as Alvania verrilli (Friele, 1886) (basis of record)
Portlandia aestuariorum (Mosevich, 1928) (basis of record)
Retusa pertenuis (Mighels, 1843) (basis of record)
Retusophiline lima (T. Brown, 1827) (basis of record)