• Abaconia naufraga (Clench, 1938) accepted as Litiopa melanostoma Rang, 1829
• Achaiohydrobia moreana Hofman & Grego, 2021
• Acicularia lubrica Monterosato, 1890 accepted as Melanella lubrica (Monterosato, 1890)
• Acicularia monterosatoi Monterosato, 1890 accepted as Melanella monterosatoi (Monterosato, 1890)
• Acicularia pernula Monterosato, 1890 accepted as Melanella pernula (Monterosato, 1890)
• Acicularia translucens Monterosato, 1890 accepted as Melanella translucens (Monterosato, 1890)
• Acinopsis cancellata (da Costa, 1778) accepted as Alvania cancellata (da Costa, 1778)
• Acinopsis hirta Monterosato, 1884 accepted as Alvania hirta (Monterosato, 1884)
• Acinopsis subcrenulata (Bucquoy, Dautzenberg & Dollfus, 1884) accepted as Alvania subcrenulata (Bucquoy, Dautzenberg & Dollfus, 1884)
• Acinopsis venter F. Nordsieck, 1972 accepted as Alvania cancellata (da Costa, 1778)
• Acinus hispidulus Monterosato, 1884 accepted as Alvania hispidula (Monterosato, 1884)
• Acirsa (Plesioacirsa) corsicana F. Nordsieck, 1974 accepted as Opalia coronata (R. A. Philippi & Scacchi, 1840)
• Acirsa borealis (Lyell, 1841)
• Acirsa coarctata (Jeffreys, 1884)
• Acirsa gracilis Verrill, 1880 accepted as Periapta gracilis (Verrill, 1880)
• Acirsa praelonga Jeffreys, 1877 accepted as Papuliscala praelonga (Jeffreys, 1877)
• Acirsa sarsii (Kobelt, 1903) accepted as Gregorioiscala sarsii (Kobelt, 1903)
• Acirsa subdecussata (Cantraine, 1835)
• Aclis acuta (Jeffreys, 1884) accepted as Parastilbe acuta (Jeffreys, 1884)
• Aclis ascaris (W. Turton, 1819)
• Aclis attenuans Jeffreys, 1883
• Aclis farolita F. Nordsieck, 1969 accepted as Graphis albida (Kanmacher, 1798)
• Aclis gulsonae (W. Clark, 1850)
• Aclis gulsonae var. tenuicula Jeffreys, 1867 accepted as Aclis gulsonae (W. Clark, 1850)
• Aclis jeffreysii Tryon, 1887 accepted as Graphis striata (Jeffreys, 1884)
• Aclis lineata Monterosato, 1869 accepted as Fusceulima lineata (Monterosato, 1869)
• Aclis minor (T. Brown, 1827)
• Aclis mizon R. B. Watson, 1881 accepted as Costaclis mizon (R. B. Watson, 1881)
• Aclis muchia Locard, 1896 accepted as Aclis mizon R. B. Watson, 1881 accepted as Costaclis mizon (R. B. Watson, 1881)
• Aclis sarsi Dautzenberg & H. Fischer, 1912
• Aclis tricarinata R. B. Watson, 1897 accepted as Pseudoscilla bilirata (de Folin, 1870)
• Aclis trilineata R. B. Watson, 1897
• Aclis ventrosa Friele, 1876 accepted as Hemiaclis ventrosa (Friele, 1876)
• Aclis ventrosa var. minor Friele, 1876 accepted as Hemiaclis ventrosa (Friele, 1876)
• Aclis verduini van Aartsen, Menkhorst & Gittenberger, 1984 accepted as Aclis trilineata R. B. Watson, 1897
• Aclis vitrea R. B. Watson, 1897
• Aclis walleri Jeffreys, 1867
• Aclis walleri var. carinata Norman, 1879 accepted as Aclis sarsi Dautzenberg & H. Fischer, 1912
• Acmaturris vatovai F. Nordsieck, 1971 accepted as Kurtziella serga (Dall, 1881)
• Acrilloscala lamyi (de Boury, 1909)
• Acrochalix callosa Bouchet & Warén, 1986
• Acrybia glacialis Thorson, 1951 accepted as Bulbus smithii T. Brown, 1839
• Actinotrophon actinophorus (Dall, 1889)
• Adeorbis exquisitus Jeffreys, 1883 accepted as Tjaernoeia exquisita (Jeffreys, 1883)
• Adeorbis fragilis G. O. Sars, 1878 accepted as Rugulina fragilis (G. O. Sars, 1878)
• Adeorbis imperspicuus Chaster, 1895 accepted as Tjaernoeia exquisita (Jeffreys, 1883)
• Adeorbis imperspicuus Monterosato, 1875 accepted as Tjaernoeia exquisita (Jeffreys, 1883)
• Adeorbis imperspicuus var. elegantula Chaster, 1895 accepted as Tjaernoeia exquisita (Jeffreys, 1883)
• Adeorbis seguenzai [sic] accepted as Adeorbis seguenzianus Tryon, 1888 accepted as Megalomphalus disciformis (Granata Grillo, 1877)
• Adeorbis seguenzianus Tryon, 1888 accepted as Megalomphalus disciformis (Granata Grillo, 1877)
• Adeorbis supranitidus S. V. Wood, 1848 accepted as Circulus supranitidus (S. V. Wood, 1848)
• Adeorbis tricarinatus S. V. Wood, 1848 † accepted as Circulus striatus (R. A. Philippi, 1836)
• Adeorbis umbilicatus Locard, 1898 accepted as Xyloskenea naticiformis (Jeffreys, 1883)
• Adeorbis unisulcatus Chaster, 1897 accepted as Tjaernoeia unisulcata (Chaster, 1897)
• Admete abnormis Harmer, 1918 accepted as Admete viridula (O. Fabricius, 1780)
• Admete azorica Bouchet & Warén, 1985 accepted as Brocchinia azorica (Bouchet & Warén, 1985)
• Admete borealis A. Adams, 1855 accepted as Admete viridula (O. Fabricius, 1780)
• Admete clivicola Høisæter, 2011
• Admete contabulata Friele, 1879
• Admete cornidei Altimira, 1978 accepted as Admetula cornidei (Altimira, 1978)
• Admete couthouyi (Jay, 1839) accepted as Admete viridula (O. Fabricius, 1780)
• Admete crispa Møller, 1842 accepted as Admete viridula (O. Fabricius, 1780)
• Admete grandis Mörch, 1869 accepted as Admete viridula (O. Fabricius, 1780)
• Admete nodosa A. E. Verrill & S. Smith, 1885 accepted as Brocchinia nodosa (A. E. Verrill & S. Smith, 1885)
• Admete sadko Gorbunov, 1946
• Admete undatocostata Verkrüzen, 1875 accepted as Admete viridula (O. Fabricius, 1780)
• Admete viridula (O. Fabricius, 1780)
• Admete viridula var. distincta Leche, 1878 accepted as Admete viridula (O. Fabricius, 1780)
• Admete viridula var. elongata Leche, 1878 accepted as Admete viridula (O. Fabricius, 1780)
• Admete viridula var. grandis Mörch, 1869 accepted as Admete grandis Mörch, 1869 accepted as Admete viridula (O. Fabricius, 1780)
• Admete viridula var. producta G. O. Sars, 1878 accepted as Admete viridula (O. Fabricius, 1780)
• Admete viridula var. undata Leche, 1878 accepted as Admete viridula (O. Fabricius, 1780)
• Admetula cornidei (Altimira, 1978)
• Aegeofusinus angeli (Russo & Angelidis, 2016) accepted as Pseudofusus angeli (Russo & Angelidis, 2016)
• Aegeofusinus eviae (Buzzurro & Russo, 2007) accepted as Pseudofusus eviae (Buzzurro & Russo, 2007)
• Aegeofusinus margaritae (Buzzurro & Russo, 2007) accepted as Pseudofusus margaritae (Buzzurro & Russo, 2007)
• Aegeofusinus patriciae (Russo & Olivieri, 2013) accepted as Pseudofusus patriciae Russo & Olivieri, 2013)
• Aegeofusinus profetai (Nofroni, 1982) accepted as Pseudofusus profetai (Nofroni, 1982)
• Aegeofusinus rolani (Buzzurro & Ovalis, 2005) accepted as Pseudofusus rolani (Buzzurro & Ovalis, 2005)
• Aforia hypomela (Dall, 1889)
• Aforia serranoi Gofas, Kantor & Luque, 2014
• Afrocanidea gemma Connolly, 1929 accepted as Gutturnium muricinum (Röding, 1798)
• Akibumia orientalis (Schepman, 1909)
• Alaba culliereti (Dautzenberg, 1890)
• Alaba mirabilis (Hornung & Mermod, 1926) accepted as Gibborissoia virgata (R. A. Philippi, 1849)
• Albertisia punica Issel, 1880 accepted as Truncatella subcylindrica (Linnaeus, 1767)
• Alcidia spinosa Monterosato, 1890 accepted as Alvania spinosa (Monterosato, 1890)
• Aliceia aenigmatica Dautzenberg & H. Fischer, 1897
• Alora retifera Bouchet & Warén, 1986
• Alora tenerrima (Dautzenberg & H. Fischer, 1896)
• Alvania (Alvinia) clathrella L. Seguenza, 1903 accepted as Alvania clathrella L. Seguenza, 1903
• Alvania (Crisilla) chiarellii Cecalupo & Quadri, 1995 accepted as Crisilla chiarellii (Cecalupo & Quadri, 1995)
• Alvania (Crisilla) marioni Fasulo & Gaglini, 1987 accepted as Crisilla marioni (Fasulo & Gaglini, 1987)
• Alvania (Crisilla) postrema Gofas, 1990 accepted as Crisilla postrema (Gofas, 1990)
• Alvania (Moniziella) verduini van Aartsen, 1983 accepted as Manzonia vigoensis (Rolán, 1983)
• Alvania aartseni Verduin, 1986
• Alvania abstersa van der Linden & van Aartsen, 1994
• Alvania abyssicola (Forbes, 1850) accepted as Alvania testae (Aradas & Maggiore, 1844)
• Alvania adiaphoros Bouchet & Warén, 1993
• Alvania adinogramma Bouchet & Warén, 1993