Aaptos adriatica Gray, 1867 accepted as Aaptos aaptos (Schmidt, 1864) (basis of record)
Aaptos niger Hoshino, 1981 (basis of record)
Abatus ingens Koehler, 1926 (basis of record)
Abatus nimrodi (Koehler, 1911) (basis of record)
Abatus philippii Lovén, 1871 (basis of record)
Abra intermedia Thompson accepted as Abra nitida (O.F. Müller, 1776) (basis of record)
Acanthascus grossularia Schulze, 1886 accepted as Rossella antarctica Carter, 1872 (basis of record)
Acanthaster brevispinus Fisher, 1917 (basis of record)
Acanthella aurantiaca Keller, 1889 accepted as Stylissa carteri (Dendy, 1889) (basis of record)
Acanthella cactiformis Carter, 1885 accepted as Rhaphoxya cactiformis (Carter, 1885) (basis of record)
Acanthella carteri Dendy, 1889 accepted as Stylissa carteri (Dendy, 1889) (basis of record)
Acanthella cavernosa Dendy, 1922 (basis of record)
Acanthella costata Kieschnick, 1900 (basis of record)
Acanthella hirciniopsis Carter, 1885 accepted as Rhaphoxya cactiformis (Carter, 1885) (basis of record)
Acanthella inflexa (Pulitzer-Finali, 1982) (basis of record)
Acanthella klethra Pulitzer-Finali, 1982 accepted as Acanthella cavernosa Dendy, 1922 (basis of record)
Acanthella pulcherrima Ridley & Dendy, 1886 (basis of record)
Acanthella stipitata Carter, 1881 accepted as Phakellia stipitata (Carter, 1881) (basis of record)
Acanthella tenuispiculata Dendy, 1897 (basis of record)
Acanthellina parviconulata Carter, 1885 accepted as Rhaphoxya cactiformis (Carter, 1885) (basis of record)
Acanthellina rugolineata Carter, 1885 accepted as Rhaphoxya cactiformis (Carter, 1885) (basis of record)
Acanthephyra smithi Kemp, 1939 (basis of record)
Acanthephyra tenuipes (Spence Bate, 1888) (basis of record)
Acanthochaetetes wellsi Hartman & Goreau, 1975 (basis of record)
Acanthochites aberrans Odhner, 1919 accepted as Acanthochitona aberrans (Odhner, 1919) (basis of record)
Acanthocidaris curvatispinis (Bell, 1892) (basis of record)
Acanthopleura gemmata (Blainville, 1825) (basis of record)
Acanthopleura spinosa (Bruguière, 1792) accepted as Acanthopleura gemmata (Blainville, 1825) (basis of record)
Acanthorhabdus fragilis Burton, 1929 (basis of record)
Acanthosquilla derijardi Manning, 1970 (basis of record)
Acanthostrongylophora ashmorica Hooper, 1984 (basis of record)
Acanthoxa werthi Hentschel, 1914 accepted as Spanioplon werthi (Hentschel, 1914) (basis of record)
Acanthoxifer ceylonensis Dendy, 1905 accepted as Myrmekioderma granulatum (Esper, 1794) (basis of record)
Acanthoxifer fourmanoiri Lévi, 1956 accepted as Myrmekioderma granulatum (Esper, 1794) (basis of record)
Acar plicata (Dillwyn, 1817) accepted as Arca plicata Chemnitz, 1795 (basis of record)
Acarnus bergquistae van Soest, Hooper & Hiemstra, 1991 (basis of record)
Acarnus hoshinoi van Soest, Hooper & Hiemstra, 1991 (basis of record)
Acarnus tenuis Dendy, 1896 (basis of record)
Acarnus ternatus Ridley, 1884 (basis of record)
Acarnus thielei Lévi, 1958 (basis of record)
Acarnus wolffgangi Keller, 1889 (basis of record)
Acartia fossae Gurney, 1927 (basis of record)
Acaudina leucoprocta (H.L. Clark, 1938) (basis of record)
Acervochalina velinea de Laubenfels, 1954 accepted as Chalinula velinea (de Laubenfels, 1954) (basis of record)
Achaeus brevirostris (Haswell, 1879) (basis of record)
Achaeus lacertosus Stimpson, 1858 (basis of record)
Achelia spicata (Hodgson, 1915) (basis of record)
Achinoe australis Gray, 1867 accepted as Plakina australis (Gray, 1867) (basis of record)
Achramorpha glacialis Jenkin, 1908 (basis of record)
Acodontaster capitatus (Koehler, 1912) (basis of record)
Acodontaster hodgsoni (Bell, 1908) (basis of record)
Acropora pustulosa (Milne Edwards & Haime) accepted as Acropora pharaonis (Milne Edwards & Haime, 1860) (basis of record)
Actaea calculosa (H. Milne Edwards, 1834) (basis of record)
Actaea depressa (White) accepted as Forestia depressa (White, 1848) (basis of record)
Actaea jacquelinae Guinot, 1976 (basis of record)
Actaea polyacantha (Heller, 1861) (basis of record)
Actaea savignyi (Milne Edwards, 1834) (basis of record)
Actaea spinosissima Borradaile, 1902 (basis of record)
Actaea tomentosa (H. Milne Edwards, 1834) accepted as Actaeodes tomentosus (H. Milne Edwards, 1834) (basis of record)
Actaeodes consobrinus (A. Milne-Edwards, 1873) (basis of record)
Actaeodes hirsutissimus (Rüppell, 1830) (basis of record)
Actaeodes tomentosus (H. Milne Edwards, 1834) (basis of record)
Actinometra distincta Carpenter, 1888 accepted as Comaster distinctus (Carpenter, 1888) (basis of record)
Actinometra maculata Carpenter, 1888 accepted as Comatella maculata (Carpenter, 1888) (basis of record)
Actinopyga banwarthi (Panning, 1944) (basis of record)
Actinopyga mauritiana (Quoy & Gaimard, 1834) (basis of record)
Actinopyga miliaris (Quoy & Gaimard, 1834) (basis of record)
Actinopyga obesa (Selenka, 1867) (basis of record)
Actinopyga serratidens Pearson, 1903 (basis of record)
Actumnus forficigerus (Stimpson, 1858) (basis of record)
Actumnus laevigatus Rathbun, 1911 (basis of record)
Actumnus setifer (De Haan, 1835) (basis of record)
Adacnarca nitens Pelseneer, 1903 (basis of record)
Adamussium colbecki (E.A. Smith, 1902) (basis of record)
Adelascopora jeqolqa Moyano, 1989 (basis of record)
Adocia venustina Bergquist, 1961 accepted as Haliclona venustina (Bergquist, 1961) (basis of record)
Aegaeon cataphractus (Olivi, 1792) (basis of record)
Aegialonemertes chlorophthalma Gibson, 1990 (basis of record)
Aenigmanemertes norenburgi Sundberg & Gibson, 1995 (basis of record)
Aetheorhynchus actites Gibson, 1981 (basis of record)
Aforia multispiralis Dell, 1990 (basis of record)
Afromysis australiensis W. Tattersall, 1940 accepted as Doxomysis australiensis (W. Tattersall, 1940) (basis of record)
Agelas axifera Hentschel, 1911 (basis of record)
Agelas cavernosa Thiele, 1903 (basis of record)
Agelas mauritiana (Carter, 1883) (basis of record)
Agnesia glaciata Michaelsen, 1898 accepted as Agnezia glaciata Michaelsen, 1898 (basis of record)
Aimulosia antarctica (Powell, 1967) (basis of record)
Aka mucosa (Bergquist, 1965) (basis of record)
Aka paratypica Fromont, 1993 (basis of record)
Akera soluta (Gmelin, 1791) (basis of record)
Akibumia orientalis (Schepman, 1909) (basis of record)
Alcyoncellum gelatinosum Blainville, 1834 accepted as Sycon gelatinosum (Blainville, 1834) (basis of record)
Alcyonium aurantium Pallas, 1766 accepted as Tethya aurantium (Pallas, 1766) (basis of record)
Alcyonium boletus Lamarck, 1815 accepted as Thorectandra boletus (Lamarck, 1815) (basis of record)
Alcyonium cuspidiferum Lamarck, 1815 accepted as Cervicornia cuspidifera (Lamarck, 1815) (basis of record)
Alcyonium epiphytum Lamarck, 1815 accepted as Protosuberites epiphytum (Lamarck, 1815) (basis of record)
Alcyonium granulatum Esper, 1794 accepted as Myrmekioderma granulatum (Esper, 1794) (basis of record)
Alcyonium opuntioides Lamarck, 1815 accepted as Antho opuntioides (Lamarck, 1815) (basis of record)
Alebion proximum Ridley, 1881 accepted as Iophon proximum (Ridley, 1881) (basis of record)
Alecto flagellata Müller, 1841 accepted as Dichrometra flagellata (Müller, 1841) (basis of record)