Actinia alba Risso, 1827 (additional source)
Actinia anemone Ellis, 1768 accepted as Homostichanthus duerdeni Carlgren, 1900 (additional source)
Actinia bicornis Müller, 1776 (additional source)
Actinia candida Müller, 1776 accepted as Metridium senile (Linnaeus, 1761) (additional source)
Actinia caryophyllus (additional source)
Actinia coccinea Müller, 1776 accepted as Stomphia coccinea (Müller, 1776) (additional source)
Actinia crassicornis Müller, 1776 accepted as Urticina crassicornis (Müller, 1776) (additional source)
Actinia ditata accepted as Hormathia digitata (O.F. Müller, 1776) (additional source)
Actinia effoeta Linnaeus, 1767 accepted as Calliactis parasitica (Couch, 1842) (additional source)
Actinia fiscella Müller, 1789 (additional source)
Actinia gigantea (Forskål, 1775) accepted as Stichodactyla gigantea (Forsskål, 1775) (additional source)
Actinia iris Müller, 1789 (additional source)
Actinia judaica (Linnaeus, 1761) (additional source)
Actinia nodosa Fabricius, 1780 accepted as Hormathia nodosa (Fabricius, 1780) (additional source)
Actinia plumosa accepted as Metridium dianthus (Ellis, 1768) (additional source)
Actinia priapus accepted as Calliactis parasitica (Couch, 1842) (additional source)
Actinia pusilla Swartz, 1788 (additional source)
Actinia rufa Risso, 1827 (additional source)
Actinia spectabilis Fabricii, 1780 accepted as Hormathia digitata (O.F. Müller, 1776) (additional source)
Actinia truncata Müller, 1776 (additional source)
Actinia undata Ilmoni, 1830 accepted as Actinothoe clavata (Ilmoni, 1830) accepted as Sagartiogeton undatus (Müller, 1778) accepted as Cylista undata (Müller, 1778) accepted as Sagartia undata (Müller, 1778) (additional source)
Actinia viduata W. Thompson accepted as Sagartia troglodytes (Price in Johnston, 1847) accepted as Cylista troglodytes (Price in Johnston, 1847) (additional source)
Actinia viridis Gmelin accepted as Anemonia viridis (Forsskål, 1775) (additional source)
Actinia volva Müller, 1776 (additional source)
Hydra aster (Ellis, 1768) accepted as Actinia aster Ellis, 1768 (additional source)
Hydra bellis (Ellis & Solander, 1786) accepted as Cereus pedunculatus (Pennant, 1777) (additional source)
Hydra calendula (Hughes in Ellis & Solander, 1786) accepted as Petalactis calendula (Hughes in Ellis & Solander, 1786) (additional source)
Hydra cereus (Ellis & Solander, 1786) (additional source)
Hydra dianthus (Ellis, 1768) accepted as Metridium dianthus (Ellis, 1768) (additional source)
Hydra doliolum (Pallas, 1766) accepted as Actinia doliolum Pallas, 1766 accepted as Pentacta doliolum (Pallas, 1766) (additional source)
Hydra gemmacea (Ellis & Solander, 1786) accepted as Actinia gemmacea Ellis & Solander, 1786 accepted as Aulactinia verrucosa (Pennant, 1777) accepted as Bunodactis verrucosa (Pennant, 1777) (additional source)
Hydra Helianthus (Ellis, 1768) accepted as Actinia helianthus Ellis, 1768 accepted as Stichodactyla helianthus (Ellis, 1768) (additional source)
Hydra mesembryanthemum (Ellis & Solander, 1786) accepted as Actinia mesembryanthemum Ellis & Solander, 1786 accepted as Actinia nigropunctata den Hartog & Ocaña, 2003 (additional source)
Hydra sociata (Ellis, 1768) accepted as Actinia sociata Ellis, 1768 accepted as Zoanthus sociatus (Ellis, 1768) (additional source)