Aaata de Laubenfels, 1930 accepted as Clathria Schmidt, 1862 (extant flag source)
Aaptos Gray, 1867 (habitat flag source)
Aaptos adriatica Gray, 1867 accepted as Aaptos aaptos (Schmidt, 1864) (source of synonymy)
Aaptos adriatica Gray, 1867 accepted as Aaptos aaptos (Schmidt, 1864) (extant flag source)
Aaptos alphiensis Samaai & Gibbons, 2005 (current name source)
Aaptos bergmanni de Laubenfels, 1950 (current name source)
Aaptos ciliata (Wilson, 1925) (current name source)
Aaptos confertus Kelly-Borges & Bergquist, 1994 (current name source)
Aaptos duchassaingi (Topsent, 1889) (current name source)
Aaptos durissima (Carter, 1882) (current name source)
Aaptos globosum Kelly-Borges & Bergquist, 1994 (current name source)
Aaptos horrida (Carter, 1886) (current name source)
Aaptos niger Hoshino, 1981 (current name source)
Aaptos niger Hoshino, 1981 (extant flag source)
Aaptos nuda (Kirkpatrick, 1903) (current name source)
Aaptos papillata (Keller, 1880) (current name source)
Aaptos pernucleata (Carter, 1870) (current name source)
Aaptos rosacea Kelly-Borges & Bergquist, 1994 (current name source)
Aaptos suberitoides (Brøndsted, 1934) (current name source)
Aaptos tentum Kelly-Borges & Bergquist, 1994 (current name source)
Aaptos vannamei de Laubenfels, 1935 (current name source)
Aartsenia Warén, 1991 (habitat flag source)
Aartsenia candida (Møller, 1842) (current name source)
Abarenicola claparedei (Levinsen, 1884) (current name source)
Abatus Troschel, 1851 (habitat flag source)
Abatus beatriceae (Larrain, 1986) (current name source)
Abatus bidens Mortensen, 1910 (current name source)
Abatus cavernosus (Philippi, 1845) (current name source)
Abatus cordatus (Verrill, 1876) (current name source)
Abatus curvidens Mortensen, 1836 (current name source)
Abatus elongatus (Koehler, 1908) (current name source)
Abatus ingens Koehler, 1926 (current name source)
Abatus ingens Koehler, 1926 (extant flag source)
Abatus nimrodi (Koehler, 1911) (current name source)
Abatus nimrodi (Koehler, 1911) (extant flag source)
Abatus philippi Loven, 1871 accepted as Abatus philippii Lovén, 1871 (basis of record)
Abatus philippi Loven, 1871 accepted as Abatus philippii Lovén, 1871 (source of synonymy)
Abatus philippi Loven, 1871 accepted as Abatus philippii Lovén, 1871 (extant flag source)
Abatus philippii Lovén, 1871 (current name source)
Abatus philippii Lovén, 1871 (extant flag source)
Abatus shackletoni Koehler, 1911 (current name source)
Abditodentrix Patterson, 1985 (habitat flag source)
Abditodentrix rhomboidalis (Millett, 1899) (current name source)
Aberomysis muranoi Bacescu & Iliffe, 1986 (current name source)
Abietinaria Kirchenpauer, 1884 (habitat flag source)
Abietinella Levinsen, 1913 (habitat flag source)
Abila Gray, 1867 accepted as Raspailia Nardo, 1833 (extant flag source)
Abollifer Vørs, 1992 (habitat flag source)
Abollifer prolabens Vørs, 1992 (current name source)
Abortipedia Unnithan, 1962 (habitat flag source)
Abothrium gadi van Beneden, 1871 (current name source)
Abra Lamarck, 1818 (habitat flag source)
Abra intermedia Thompson accepted as Abra nitida (O.F. Müller, 1776) (source of synonymy)
Abra intermedia Thompson accepted as Abra nitida (O.F. Müller, 1776) (extant flag source)
Abra lactea Dunker, 1862 (current name source)
Abra longicallus (Scacchi, 1835) (current name source)
Abra petiti (Dautzenberg, 1923) (current name source)
Abra renieri (Bronn, 1831) (basis of record)
Abra renieri (Bronn, 1831) (current name source)
Abra renieri (Bronn, 1831) (extant flag source)
Abra segmentum (Récluz, 1843) (current name source)
Abralia Gray, 1849 (habitat flag source)
Abraliopsis Joubin, 1896 (habitat flag source)
Abranches Smith, 1947 accepted as Gobiopsis Steindachner, 1861 (habitat flag source)
Abyla Quoy & Gaimard, 1827 (habitat flag source)
Abylidae L. Agassiz, 1862 (habitat flag source)
Abylopsis Chun, 1888 (habitat flag source)
Abyssascidia Herdman, 1880 (habitat flag source)
Abyssaster tara (Wood-Mason & Alcock, 1891) (current name source)
Abyssidrilus profundus (Cook, 1970) (current name source)
Abyssijaera Menzies, 1962 accepted as Katianira Hansen, 1916 (basis of record)
Abyssijaera Menzies, 1962 accepted as Katianira Hansen, 1916 (extant flag source)
Abyssijaera acarina Menzies, 1962 (basis of record)
Abyssijaera acarina Menzies, 1962 (current name source)
Abyssijaera acarina Menzies, 1962 (extant flag source)
Abyssoclymene annularis Hartman, 1967 (current name source)
Abyssocucumis Heding, 1942 (habitat flag source)
Abyssocucumis abyssorum (Théel, 1886) (current name source)
Abyssocucumis liouvillei (Vaney, 1914) Gutt, 1988 (current name source)
Abyssocucumis tourqueti (Vaney, 1906) (current name source)
Abyssogyra vemae Clarke, 1961 (current name source)
Abyssoninoe abyssorum (McIntosh, 1885) (current name source)
Abyssoninoe hibernica (Mc Intosh, 1903) (current name source)
Abyssoninoe scopa (Fauchald, 1974) sensu Miura, 1980 (current name source)
Abyssorchomene abyssorum (Stebbing, 1888) (current name source)
Abyssorchomene chevreuxi (Stebbing, 1906) (current name source)
Acabaria Gray, 1859 accepted as Melithaea Milne Edwards, 1857 (habitat flag source)
Acabaria pulchra Hickson, 1937 (current name source)
Acaenomolgus protulae (Stock, 1959) (current name source)
Acaenomolgus serpulae (Stock, 1960) (current name source)
Acamas Duchassaing & Michelotti, 1864 accepted as Mycale Gray, 1867 (extant flag source)
Acanella Gray, 1870 (habitat flag source)
Acanthacarnus Lévi, 1952 accepted as Acarnus Gray, 1867 (extant flag source)
Acanthacarnus Lévi, 1952 accepted as Acarnus Gray, 1867 (habitat flag source)
Acanthamoeba gigantea Schmoller, 1964 (current name source)
Acanthancora aenigma (Lundbeck, 1910) (current name source)
Acanthancora coralliophila van Soest, 1984 (current name source)
Acanthancora cyanocrypta (de Laubenfels, 1930) (current name source)
Acanthancora schmidti (Topsent, 1898) (current name source)
Acanthancora stylifera Burton, 1959 (current name source)