WoRMS Taxon list
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- Aaadonta Solem, 1976
- Aaata Laubenfels, 1930 accepted as Clathria (Microciona) Bowerbank, 1862
- Aaata brepha Laubenfels, 1930 accepted as Clathria (Microciona) brepha (Laubenfels, 1930)
- Aaata spongigartina Laubenfels, 1930 accepted as Clathria (Microciona) spongigartina (Laubenfels, 1930)
- Aahithis Schallreuter, 1988 †
- Aaleniella Plumhoff, 1963 †
- Aaleniella (Aaleniella) Plumhoff, 1963 †
- Aaleniella (Danocythere) Christensen & Kilenyi, 1970 †
- Aapticheilichthys Huber, 2011
- Aapticheilichthys websteri (Huber, 2007)
- Aaptolasma Newman & Ross, 1971 accepted as Hexelasma Hoek, 1913
- Aaptolasma americanum (Pilsbry, 1916) accepted as Hexelasma americanum Pilsbry, 1916
- Aaptolasma arafurae (Hoek, 1883) accepted as Hexelasma arafurae Hoek, 1913
- Aaptolasma brintoni Newman & Ross, 1971 accepted as Hexelasma brintoni (Newman & Ross, 1971)
- Aaptolasma callistoderma (Pilsbry, 1911) accepted as Hexelasma callistoderma Pilsbry, 1911
- Aaptolasma ecaudatum (Hiro, 1933) accepted as Pachylasma ecaudatum Hiro, 1939
- Aaptolasma fosteri (Newman & Ross, 1971) accepted as Mesolasma fosteri (Newman & Ross, 1981)
- Aaptolasma leptoderma Newman & Ross, 1971 accepted as Hexelasma leptoderma (Newman & Ross, 1971)
- Aaptolasma nolearia Foster, 1978 accepted as Hexelasma nolearia Foster, 1978
- Aaptolasma triderma Newman & Ross, 1971 accepted as Hexelasma triderma (Newman & Ross, 1971)
- Aaptos Gray, 1867
- Aaptos aaptos (Schmidt, 1864)
- Aaptos aaptos var. nigra Lévi, 1961 accepted as Aaptos suberitoides (Brøndsted, 1934)
- Aaptos adriatica Gray, 1867 accepted as Aaptos aaptos (Schmidt, 1864)
- Aaptos alphiensis Samaai & Gibbons, 2005
- Aaptos bergmanni de Laubenfels, 1950
- Aaptos chromis de Laubenfels, 1954 accepted as Aaptos suberitoides (Brøndsted, 1934)
- Aaptos ciliata (Wilson, 1925)
- Aaptos conferta Kelly-Borges & Bergquist, 1994
- Aaptos duchassaingi (Topsent, 1889)
- Aaptos durissima (Carter, 1882)
- Aaptos globosa Kelly-Borges & Bergquist, 1994
- Aaptos glutinans Moraes, 2011
- Aaptos hajdui Carvalho, da Silva & Pinheiro, 2013
- Aaptos horrida (Carter, 1886)
- Aaptos kanuux Lehnert, Hocevar & Stone, 2008
- Aaptos laxosuberites (Sollas, 1902)
- Aaptos lithophaga (Wiedenmayer, 1977) accepted as Aaptos pernucleata (Carter, 1870)
- Aaptos lobata Calcinai, Bastari, Bertolino & Pansini, 2017
- Aaptos niger Hoshino, 1981
- Aaptos nuda (Kirkpatrick, 1903)
- Aaptos papillata (Keller, 1880)
- Aaptos pernucleata (Carter, 1870)
- Aaptos potiguarensis Carvalho, da Silva & Pinheiro, 2013
- Aaptos robustus Plotkin & Janussen, 2008
- Aaptos rosacea Kelly-Borges & Bergquist, 1994
- Aaptos simplex (Lambe, 1893)
- Aaptos suberitoides (Brøndsted, 1934)
- Aaptos tenta Kelly-Borges & Bergquist, 1994
- Aaptos unispiculus (Carter, 1880) accepted as Eurypon unispiculum (Carter, 1880)
- Aaptos vannamei de Laubenfels, 1935
- Aaptosyax Rainboth, 1991
- Aaptosyax grypus Rainboth, 1991
- Aaptotoichus Loeblich & Tappan, 1982 †
- Aaptotoichus challengeri Holbourn & Kaminski, 1995 †
- Aaptotoichus clavellatus (Loeblich & Tappan, 1946) †
- Aaptotoichus mutinensis Haig & McCartain, 2010 †
- Aaptotoichus quinnaniensis Haig, 2003 †
- Aarchaeocidaris Webster, 1997 † accepted as Palaechinus McCoy, 1844 †
- Aarchaeocidaris strawberryensis Webster, 1997 †
- Aaronia A. H. Verrill, 1950 accepted as Muricanthus Swainson, 1840 accepted as Hexaplex Perry, 1810
- Aaronsohnia Warb. & Eig
- Aaronsohnia factorovskyi Warb. & Eig
- Aaronsohnia pubescens (Desf.) K.Bremer & Humphries
- Aaronsohnia pubescens subsp. maroccana (Ball) Fennane & Ibn Tattou
- Aaronsohnia pubescens subsp. maroccana (Ball) Förther & Podlech accepted as Aaronsohnia pubescens subsp. maroccana (Ball) Fennane & Ibn Tattou
- Aaronsohnia pubescens subsp. pubescens (Desf.) K.Bremer & Humphries
- Aartsenia Warén, 1991
- Aartsenia arctica (Dall & Bartsch, 1909)
- Aartsenia candida (Møller, 1842)
- Aartsenia japonica (A. Adams, 1860)
- Aartsenia martensi (Dall & Bartsch, 1906)
- Aartsenia sagamiensis Kuroda & Habe, 1971
- Aatolana Bruce, 1993
- Aatolana rapax Bruce, 1993
- Aatolana schioedtei (Miers, 1884)
- Aatolana springthorpei Keable, 1998
- Abacella Maslov, 1956 (nomen dubium)
- Abacella pertusa Maslov
- Abacion Rafinesque, 1820
- Abacion creolum (Chamberlin, 1942)
- Abacion highlandense (Hoffman, 1950)
- Abacion jonesi (Chamberlin, 1942)
- Abacion lactarium (Say, 1821)
- Abacion lactarius (Say, 1821)
- Abacion magnum (Loomis, 1943)
- Abacion magnum highlandense (Hoffman, 1950) accepted as Abacion magnum (Loomis, 1943)
- Abacion spinosa (Sager, 1856)
- Abacion tesselatum Rafinesque, 1820
- Abacion tesselatum creolum (Chamberlin, 1942)
- Abacion texense (Loomis, 1937)
- Abacion texensis (Loomis, 1937)
- Abacion wilhelminae Shelley, McAllister & Hollis, 2003
- Abacionidae Shelley, 1979
- Abacioninae Hoffman, 1980
- Abacionini
- Abacola Edwards C., 1891 accepted as Metis Philippi, 1843
- Abacola holothuriae Edwards, 1891 accepted as Metis holothuriae (Edwards, 1891)
- Abaconia Clench, 1938 accepted as Litiopa Rang, 1829
- Abaconia naufraga (Clench, 1938) accepted as Litiopa melanostoma Rang, 1829