• Abbottella bompardopolensis Bartsch, 1946
• Abbottipoma crossei (Pilsbry, 1933)
• Abyssochrysos bituminifer (C. W. Cooke, 1919) †
• Abyssocomitas kurilokamchatica Sysoev & Kantor, 1986
• Abyssotrophon hadalis (Sysoev, 1992)
• Abyssotrophon panamensis (Dall, 1902)
• Acamptogenotia colpophora (Cossmann, 1889) † accepted as Pseudotoma colpophora Cossmann, 1889 †
• Acanthais triangularis (Blainville, 1832)
• Acanthinucella punctulata (J. E. Gray, 1835)
• Acanthotrophon aquensis Lozouet, 1999 †
• Acanthotrophon striatus (Gabb, 1873) †
• Acicula (Acicula) fusca fuscosa Schlickum & Geissert, 1980 † accepted as Acicula lineata (Draparnaud, 1801)
• Acicula (Acicula) persica Subai, 1981 represented as Acicula persica Subai, 1981
• Abbottella moreletiana (Crosse, 1873)
• Abeskunus exiguus (Eichwald, 1838)
• Abyssochrysos giganteum Kiel, K. A. Campbell, Elder & C. Little, 2008 † accepted as Ascheria gigantea (Kiel, K. A. Campbell, Elder & C. Little, 2008) †
• Abyssotrophon crystallinus (Kuroda, 1953)
• Abyssotrophon minimus (Okutani, 1964)
• Abyssotrophon weijencheni Houart & Buge, 2022
• Acamptogenotia pluriplicata (Cossmann, 1902) † accepted as Pseudotoma pluriplicata (Cossmann, 1902) †
• Acanthina rugosa DeVries, 2003 †
• Acanthodaphne boucheti Morassi & Bonfitto, 2010
• Acanthotrophon latispinosus Garrigues & D. Lamy, 2019
• Achaiohydrobia moreana Hofman & Grego, 2021
• Acicula (Acicula) lineolata (Pini, 1885) represented as Acicula lineolata (Pini, 1885)
• Abbottella haitensis Bartsch, 1946
• Abeskunus depressispira (Logvinenko & Starobogatov, 1969)
• Abyssochrysos eburneus (Locard, 1897)
• Abyssotrophon christae Egorov, 1993
• Abyssotrophon lorenzoensis (Durham, 1942)
• Abyssotrophon teratus Egorov, 1993
• Acamptogenotia loustaui (Deshayes, 1865) † accepted as Pseudotoma loustauae (Deshayes, 1865) †
• Acanthina obesa DeVries, 2003 †
• Acanthodaphne basicincta Morassi & Bonfitto, 2010
• Acanthotrophon carduus (Broderip, 1833)
• Accidenticulabrum sangiranensis (K. Martin, 1906) †
• Acicula (Acicula) lineata (Draparnaud, 1801) represented as Acicula lineata (Draparnaud, 1801)
• Acicula bakanense Steklov, 1966 † accepted as Acicula parcelineata (Clessin, 1911)
• Abbottella domingoensis Bartsch, 1946
• Abeskunus brusinianus (Clessin & W. Dybowski, 1887)
• Abyssochrysos costatus (C. W. Cooke, 1919) †
• Abyssothauma psilarosis (Barnard, 1963)
• Abyssotrophon ivanovi Egorov, 1993
• Abyssotrophon soyoae (Okutani, 1959)
• Acamptogenotia liancurtensis (de Boury, 1899) † accepted as Pseudotoma liancurtensis (de Boury, 1899) †
• Acanthina monodon (Pallas, 1774)
• Acanthodaphne abbreviata (Schepman, 1913)
• Acanthotrophon aturi (Deshayes, 1865) †
• Accidenticulabrum javanus (K. Martin, 1879) †
• Acicula (Acicula) irenae Schlickum, 1978 † accepted as Acicula edlaueri Schlickum, 1970 †
• Acicula algerensis E. Gittenberger & Boeters, 1977
• Abbottella moreletiana moreletiana (Crosse, 1873)
• Abyssobela atoxica Kantor & Sysoev, 1986
• Abyssochrysos melvilli (Schepman, 1909)
• Abyssotrophon edzoevi Egorov, 1994
• Abyssotrophon newmani Houart, Vermeij & Wiedrick, 2019
• Acamptodaphne eridmata Morassi & Bonfitto, 2010
• Acanthais brevidentata (W. Wood, 1828)
• Acanthina unicornis (Bruguière, 1789)
• Acanthodaphne pusula (Laws, 1947) †
• Acanthotrophon sorenseni (Hertlein & A. M. Strong, 1951)
• Acicula (Acicula) edlaueri Schlickum, 1970 † represented as Acicula edlaueri Schlickum, 1970 †
• Acicula (Acicula) norrisi E. Gittenberger & Boeters, 1977 represented as Acicula norrisi E. Gittenberger & Boeters, 1977
• Abbottipoma abbotti (Bartsch, 1946)
• Abyssochrysos bicinctus Bouchet, 1991
• Abyssochrysos xouthos Killeen & P. G. Oliver, 2000
• Abyssotrophon fusiformis Houart, Vermeij & Wiedrick, 2019
• Abyssotrophon odisseyi (Golikov & Sirenko, 1992)
• Acamptodaphne solomonensis Morassi & Bonfitto, 2010
• Acanthais callaoensis (J. E. Gray, 1828)
• Acanthinucella paucilirata (Stearns, 1871)
• Acanthodaphne sabellii Bonfitto & Morassi, 2006
• Acanthotrophon striatoides E. H. Vokes, 1980
• Acicula (Acicula) fusca (Montagu, 1803) represented as Acicula fusca (Montagu, 1803)
• Acicula (Acicula) parcelineata (Clessin, 1911) represented as Acicula parcelineata (Clessin, 1911)
• Abbottella moreletiana kriegeri Bartsch, 1946
• Abyssoaclis alagoensis J. Barros, Mello, F. Barros, S. Lima, Santos, Cabral & Padovan, 2003
• Abyssochrysos melanioides Tomlin, 1927
• Abyssotrophon delicatus (Kuroda, 1953)
• Abyssotrophon multicostatus (Golikov & Sirenko, 1992)
• Acamptodaphne biconica (Schepman, 1913)
• Acamptogenotia quieta (Deshayes, 1865) † accepted as Pseudotoma quieta (Deshayes, 1865) †
• Acanthina triangularis DeVries, 2003 †
• Acanthodaphne pungens Morassi & Bonfitto, 2010
• Acanthotrophon sentus S. S. Berry, 1969
• Acicula (Acicula) algerensis E. Gittenberger & Boeters, 1977 represented as Acicula algerensis E. Gittenberger & Boeters, 1977
• Acicula (Acicula) michaudiana Schlickum, 1975 † represented as Acicula michaudiana Schlickum, 1975 †
• Abbottella crataegus Watters, 2016
• Abbottipoma gabbi (Crosse, 1873)
• Abyssochrysos brasilianus Bouchet, 1991
• Abyssomelania cramptoni Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †
• Abyssotrophon hubbsi (Rokop, 1972)
• Abyssotrophon ruthenicus Egorov, 1993
• Acamptogenotia coronata (Lamarck, 1803) † accepted as Pseudotoma coronata (Lamarck, 1803) †
• Acanthina katzi Fleming, 1972 †
• Acanthinucella spirata (Blainville, 1832)
• Acanthotrophon ascensus (E. H. Vokes, 1976) †
• Acanthoxenophora sinuosa Perrilliat & Vega, 2001 †
• Acicula (Acicula) fusca sturanii Schlickum & Strauch, 1979 † accepted as Acicula sturanii Schlickum & Strauch, 1979 †
• Acicula (Hyalacme) klemmi Schlickum & Strauch, 1972 † accepted as Platyla klemmi (Schlickum & Strauch, 1972) †