Aceractis Andres, 1883 (additional source)
Aceractis draytoni M. Edw. accepted as Nemactis primula (Drayton in Dana, 1846) (additional source)
Acerominyas Andres, 1884 (additional source)
Acerominyas viridula (Quoy & Gaimard, 1833) accepted as Actinecta viridula (Quoy & Gaimard, 1833) (additional source)
Actineria (additional source)
Actineria villosa Quoy & Gaimard in de Blainville, 1830 (additional source)
Actinia Pallas, 1766 accepted as Pentacta Goldfuss, 1820 (additional source)
Actinia alba Risso, 1827 (additional source)
Actinia alderi Cocks, 1851 (additional source)
Actinia anemonoides (additional source)
Actinia atrimaculata Grube, 1840 (additional source)
Actinia aurantiaca Delle Chiaje, 1822 accepted as Condylactis aurantiaca (Delle Chiaje, 1825) (additional source)
Actinia bellii Cocks, 1850 (additional source)
Actinia bicornis Müller, 1776 (additional source)
Actinia brevicirrhata Risso, 1827 accepted as Cereus pedunculatus (Pennant, 1777) (additional source)
Actinia cari Delle Chiaje, 1822 (additional source)
Actinia carneola Stimpson, 1853 accepted as Stomphia coccinea (Müller, 1776) (additional source)
Actinia caryophyllus (additional source)
Actinia chlorodactyla Brandt, 1835 (additional source)
Actinia cleopatrae Hemprich & Ehrenberg in Ehrenberg, 1834 (additional source)
Actinia depressa Rapp, 1829 accepted as Paractinia striata (Risso, 1826) (additional source)
Actinia dubia Lesson, 1830 (additional source)
Actinia elegantissima Brandt, 1835 accepted as Anthopleura elegantissima (Brandt, 1835) (additional source)
Actinia elongata Delle Chiaje, 1825 (additional source)
Actinia equina (Linnaeus, 1758) (additional source)
Actinia erythrospilota Brandt, 1835 (additional source)
Actinia intestinalis Fabricius, 1780 accepted as Acthelmis intestinalis (Fabricius, 1780) (additional source)
Actinia iris Müller, 1789 (additional source)
Actinia judaica (Linnaeus, 1761) (additional source)
Actinia laurentii Brandt, 1835 (additional source)
Actinia mammillaris accepted as Actinia mamillaris Quoy & Gaimard, 1833 (additional source)
Actinia marsilii (additional source)
Actinia mertensii Brandt, 1835 (additional source)
Actinia minutissima Le Sueur, 1817 (additional source)
Actinia mucilaginosa altera (additional source)
Actinia mucilaginosa prima (additional source)
Actinia multiformis (additional source)
Actinia nitida Dawson, 1858 accepted as Stomphia coccinea (Müller, 1776) (additional source)
Actinia nodosa Fabricius, 1780 accepted as Hormathia nodosa (Fabricius, 1780) (additional source)
Actinia obtruncata Stimpson, 1853 (additional source)
Actinia papuana Quoy & Gaimard, 1833 (additional source)
Actinia parvitentaculata Quoy & Gaimard, 1833 accepted as Stichodactyla gigantea (Forsskål, 1775) (additional source)
Actinia peyssonelii (additional source)
Actinia pulcherrima Jordan, 1855 accepted as Sagartia elegans (Dalyell, 1848) accepted as Cylista elegans (Dalyell, 1848) (additional source)
Actinia pusilla Swartz, 1788 (additional source)
Actinia reaumuri (additional source)
Actinia reclinata Bosc, 1802 (additional source)
Actinia rosea Risso, 1827 (additional source)
Actinia rosula Ehrenberg, 1834 (additional source)
Actinia rufa Risso, 1827 (additional source)
Actinia simplex Ehrenberg, 1834 (additional source)
Actinia sinensis Andres, 1883 (additional source)
Actinia squamata Bruguiere, 1789 accepted as Taractostephanus squamosa (Bruguière, 1789) (additional source)
Actinia striata Rizzi, 1907 (additional source)
Actinia strigata Quoy & Gaimard, 1833 (additional source)
Actinia tongana Quoy & Gaimard, 1833 (additional source)
Actinia truncata Müller, 1776 (additional source)
Actinia varians Müller, 1806 (additional source)
Actinia ventricosa (additional source)
Actinia verrucosa Pennant, 1777 accepted as Aulactinia verrucosa (Pennant, 1777) accepted as Bunodactis verrucosa (Pennant, 1777) (additional source)
Actinia violacea Risso, 1827 (additional source)
Actinia volva Müller, 1776 (additional source)
Actinia yarrellii Cocks, 1851 (additional source)
Actinia zebra Grube, 1840 (additional source)
Actiniaria (additional source)
Actinodendron (additional source)
Actinodendron alcyonoideum (Quoy & Gaimard, 1833) (additional source)
Actinodendron arboreum (Quoy & Gaimard, 1833) (additional source)
Actinoloba de Blainville, 1830 (additional source)
Actinoloba achates Dana accepted as Antholoba achates (Drayton in Dana, 1846) (additional source)
Actinoloba dianthus de Blainville, 1830 accepted as Metridium senile (Linnaeus, 1761) (additional source)
Actinoloba marginata Les. accepted as Metridium senile (Linnaeus, 1761) (additional source)
Actinoloba reticulata Dana accepted as Antholoba achates (Drayton in Dana, 1846) (additional source)
Actinopsis Dana, 1856 (additional source)
Actinopsis flava Danielssen & Koren, 1856 (additional source)
Actinopsis rosea Studer, 1879 accepted as Isantheopsis rosea (Studer, 1879) (additional source)
Actinothrix accepted as Actinotryx Duchassaing de Fonbressin & Michelotti, 1860 (additional source)
Actinothrix sancti thomae Duchassaing de Fonbressin & Michelotti, 1860 accepted as Rhodactis osculifera (Le Sueur, 1817) (additional source)
Actinothrix verruculata (Klunzinger, 1877) accepted as Heteranthus verruculatus Klunzinger, 1877 (additional source)
Adamsia Dunker, 1857 accepted as Agnewia Tenison Woods, 1878 (additional source)
Adamsia bicolor Le Sueur, 1817 accepted as Calliactis tricolor (Le Sueur, 1817) (additional source)
Adamsia decorata accepted as Calliactis polypus (Forsskål, 1775) (additional source)
Adamsia egletes Duchassaing de Fombressin & Michelotti, 1866 accepted as Calliactis tricolor (Le Sueur, 1817) (additional source)
Adamsia fischeri Andres, 1883 accepted as Aiptasiogeton pellucidus (Hollard, 1848) accepted as Aiptasiogeton hyalinus (Delle Chiaje, 1822) (additional source)
Adamsia fusca Milne Edwards, 1857 (additional source)
Adamsia palliata (Fabricius, 1779) accepted as Calliactis palliata (Müller, 1776) (additional source)
Adamsia rondeletii (Delle Chiaje, 1822) accepted as Calliactis (Sagartia) parasitica (Couch, 1842) accepted as Calliactis parasitica (Couch, 1842) (additional source)
Adamsia tricolor (Le Sueur, 1817) accepted as Calliactis tricolor (Le Sueur, 1817) (additional source)
Aiptasia Gosse, 1858 (additional source)
Aiptasia agassizii Andres, 1883 accepted as Aiptasia pallida (Agassiz in Verrill, 1864) accepted as Exaiptasia pallida (Agassiz in Verrill, 1864) represented as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia annulata (Le Sueur, 1817) accepted as Bartholomea annulata (Le Sueur, 1817) (additional source)
Aiptasia carnea Andrès, 1881 accepted as Aiptasia mutabilis (Gravenhorst, 1831) (additional source)
Aiptasia couchi Gosse represented as Aiptasia couchii Gosse (additional source)
Aiptasia diaphana (Rapp, 1829) accepted as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia erythrochila (Fischer, 1874) accepted as Diadumene cincta Stephenson, 1925 (additional source)
Aiptasia inula (Duchassaing & Michelotti, 1864) accepted as Exaiptasia pallida (Agassiz in Verrill, 1864) represented as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia lacerata Dalyell accepted as Sagartiogeton laceratus (Dalyell, 1848) accepted as Sagartia lacerata (Dalyell, 1848) (additional source)
Aiptasia mimosa (Duchassaing & Michelotti, 1864) accepted as Exaiptasia pallida (Agassiz in Verrill, 1864) represented as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia minuta (Verrill, 1867) accepted as Exaiptasia pallida (Agassiz in Verrill, 1864) represented as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia mutabilis (Gravenhorst, 1831) (additional source)