Acanthotrophon striatoides E. H. Vokes, 1980 (basis of record)
Aclis eolis Bartsch, 1947 (basis of record)
Aclis hendersoni Dall, 1927 (basis of record)
Acteocina atrata P. S. Mikkelsen & P. M. Mikkelsen, 1984 (basis of record)
Acteocina bullata (Kiener, 1834) (basis of record)
Acteocina canaliculata (Say, 1826) (additional source)
Acteocina candei (A. d'Orbigny, 1841) (additional source)
Acteocina inconspicua Olsson & McGinty, 1958 (basis of record)
Acteocina lepta Woodring, 1928 (basis of record)
Acteocina perplicata (Dall, 1889) (basis of record)
Acteocina recta (A. d'Orbigny, 1841) (basis of record)
Acteon candens Rehder, 1939 (basis of record)
Acteon danaida Dall, 1881 (basis of record)
Acteon delicatus Dall, 1889 (basis of record)
Acteon incisus Dall, 1881 (basis of record)
Acteon melampoides Dall, 1881 (additional source)
Acteon perforatus Dall, 1881 (basis of record)
Adelphotectonica uruguaya (Carcelles, 1953) (additional source)
Admete microscopica (Dall, 1889) accepted as Microcancilla microscopica (Dall, 1889) (basis of record)
Aegires gomezi Ortea, Luque & Templado, 1990 (basis of record)
Aeolidiella benteva (Er. Marcus, 1958) accepted as Berghia benteva (Er. Marcus, 1958) accepted as Berghia dakariensis (Pruvot-Fol, 1953) (basis of record)
Aeolidiella stephanieae Á. Valdés, 2005 accepted as Berghia stephanieae (Á. Valdés, 2005) (additional source)
Aesopus stearnsii (Tryon, 1883) (basis of record)
Agathotoma candidissima (C. B. Adams, 1845) (basis of record)
Agatrix agassizii (Dall, 1889) (basis of record)
Alaba incerta (A. d'Orbigny, 1841) (additional source)
Alderiopsis garfio Caballer, Ortea & Espinosa, 2006 (basis of record)
Alexania floridana (Pilsbry, 1945) (basis of record)
Aliger costatus (Gmelin, 1791) accepted as Macrostrombus costatus (Gmelin, 1791) (basis of record)
Aliger gallus (Linnaeus, 1758) (additional source)
Altrix trifolium (Dall, 1881) (additional source)
Alvania auberiana (A. d'Orbigny, 1842) (additional source)
Alvania colombiana Romer & D. R. Moore, 1988 accepted as Benthonellania colombiana (Romer & D. R. Moore, 1988) (basis of record)
Alvania gradata (A. d'Orbigny, 1842) accepted as Lirobarleeia gradata (A. d'Orbigny, 1842) (basis of record)
Alvania precipitata (Dall, 1889) accepted as Benthonellania precipitata (Dall, 1889) (basis of record)
Amaea mitchelli (Dall, 1896) (basis of record)
Ammonicera albospeciosa Rolán, 1992 (basis of record)
Ammonicera circumcirra Rolán, 1992 (basis of record)
Ammonicera familiaris Rolán, 1992 (basis of record)
Ammonicera lineofuscata Rolán, 1992 (basis of record)
Ammonicera minortalis Rolán, 1992 (basis of record)
Ammonicera sculpturata Rolán, 1992 (basis of record)
Amphithalamus albus Rolán, 1992 (basis of record)
Amphithalamus niger Rolán, 1992 (basis of record)
Amphithalamus rauli Rolán, 1992 (basis of record)
Amphithalamus vallei Aguayo & Jaume, 1947 (basis of record)
Anatoma alta (R. B. Watson, 1886) (additional source)
Anatoma proxima (Dall, 1927) (additional source)
Ancistrobasis costulata (R. B. Watson, 1879) (basis of record)
Ancistrobasis depressa (Dall, 1889) (basis of record)
Angiola lineata (da Costa, 1778) accepted as Hinea lineata (da Costa, 1778) (additional source)
Anticlimax athleenae (Pilsbry & T. L. McGinty, 1946) (basis of record)
Anticlimax pilsbryi (T. L. McGinty, 1945) (basis of record)
Anticlimax proboscidea (Aguayo, 1949) (basis of record)
Anticlinura atlantica E. F. García, 2005 (additional source)
Antillophos candeanus (A. d'Orbigny, 1853) (basis of record)
Antillophos elegans (Guppy, 1866) (basis of record)
Aorotrema cistronium (Dall, 1889) (basis of record)
Aorotrema pontogenes (Schwengel & T. L. McGinty, 1942) (basis of record)
Aphelodoris antillensis Bergh, 1879 (basis of record)
Aplysia cervina (Dall & C. T. Simpson, 1901) (basis of record)
Aplysia juliana Quoy & Gaimard, 1832 (additional source)
Aplysia morio (A. E. Verrill, 1901) (additional source)
Architectonica nobilis Röding, 1798 (additional source)
Arene bairdii (Dall, 1889) (basis of record)
Arene briarea (Dall, 1881) (basis of record)
Arene centrifuga (Dall, 1896) (basis of record)
Arene cruentata (Megerle von Mühlfeld, 1824) (basis of record)
Arene microforis (Dall, 1889) (basis of record)
Arene riisei Rehder, 1943 (basis of record)
Arene tricarinata (Stearns, 1872) (basis of record)
Arene variabilis (Dall, 1889) (basis of record)
Arene venustula Aguayo & Rehder, 1936 (basis of record)
Armina wattla Ev. Marcus & Er. Marcus, 1967 (basis of record)
Ascobulla ulla (Er. Marcus & Ev. Marcus, 1970) (basis of record)
Aspella castor Radwin & D'Attilio, 1976 (basis of record)
Aspella senex Dall, 1903 (basis of record)
Assiminea succinea (L. Pfeiffer, 1840) accepted as Angustassiminea succinea (L. Pfeiffer, 1840) (additional source)
Astralium phoebium (Röding, 1798) accepted as Lithopoma phoebium (Röding, 1798) (basis of record)
Astyris amphissella (Dall, 1881) (basis of record)
Astyris diaphana A. E. Verrill, 1882 (basis of record)
Astyris lunata (Say, 1826) (additional source)
Astyris multilineata (Dall, 1889) (additional source)
Astyris profundi (Dall, 1889) accepted as Mitrella profundi (Dall, 1889) (basis of record)
Astyris raveneli Dall, 1889 (basis of record)
Astyris verrilli (Dall, 1881) (basis of record)
Atlanta brunnea J. E. Gray, 1850 (additional source)
Atlanta helicinoidea J. E. Gray, 1850 (basis of record)
Atlanta inclinata Souleyet, 1852 accepted as Atlanta inclinata J. E. Gray, 1850 (additional source)
Atlanta lesueurii Souleyet, 1852 accepted as Atlanta lesueurii J. E. Gray, 1850 (additional source)
Atlanta quoyii J. E. Gray, 1850 accepted as Atlanta inflata J. E. Gray, 1850 (basis of record)
Attiliosa aldridgei (Nowell-Usticke, 1969) (basis of record)
Attiliosa bessei E. H. Vokes, 1999 (basis of record)
Attiliosa philippiana (Dall, 1889) (additional source)
Atys caribaeus (A. d'Orbigny, 1841) (basis of record)
Atys riiseanus Mörch, 1875 (basis of record)
Atys sandersoni Dall, 1881 (basis of record)
Axelella smithii (Dall, 1888) (basis of record)
Babelomurex dalli (W. K. Emerson & D'Attilio, 1963) (additional source)
Babelomurex fax (F. M. Bayer, 1971) (additional source)

 Taxonomy

 for Simnialena uniplicata (G. B. Sowerby II, 1849)

Reijnen et al. (2010) transferred Simnialena uniplicata to Cyphoma on the basis of DNA sequence data, but did not ... [details]