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If you're from another site or search engine, chances are the page you want to visit cannot be found because it has changed its name. Here are the last pages to be renamed:

2023 update:

Cerianthus lloydii Gosse, 1859 is no longer accepted, the accepted name is Synarachnactis lloydii (Gosse, 1859).
Atalodoris neapolitana (Delle Chiaje, 1841) is no longer accepted, the accepted name is Idaliadoris neapolitana (Delle Chiaje, 1841).
Aulactinia verrucosa (Pennant, 1777) is no longer accepted, the accepted name is Bunodactis verrucosa (Pennant, 1777).
Cylista undata (Müller, 1778) is no longer accepted, the accepted name is Sagartia undata (Müller, 1778).
Swiftia pallida Madsen, 1970 is no longer accepted, the accepted name is Callistephanus pallida Madsen, 1970.

2022 update:

Bunodosoma biscayense (Fischer, 1874) is no longer accepted, the accepted name is Anthopleura biscayensis (Fischer, 1874).
Fjordia lineata (Lovén, 1846) is no longer accepted, the accepted name is Coryphella lineata (Lovén, 1846).
Flabellina cavolini (Vérany, 1846) is no longer accepted, the accepted name is Calmella cavolini (Vérany, 1846).
Knoutsodonta inconspicua (Alder & Hancock, 1851) is no longer accepted, the accepted name is Atalodoris inconspicua (Alder & Hancock, 1851).
Knoutsodonta neapolitana (Delle Chiaje, 1841) is no longer accepted, the accepted name is Atalodoris neapolitana (Delle Chiaje, 1841).
Cystoseira tamariscifolia (Hudson) Papenfuss, 1950 is no longer accepted, the accepted name is Ericaria selaginoides (Linnaeus) Molinari & Guiry, 2020.

2021 update:

Calmella cavolini (Vérany, 1846) is no longer accepted, the accepted name is Flabellina cavolini (Vérany, 1846).
Diplodus sargus cadenati de la Paz, Bauchot & Daget, 1974 is no longer accepted, the accepted name is Diplodus cadenati de la Paz, Bauchot & Daget, 1974.
Diporula verrucosa (Peach, 1868) is no longer accepted, the accepted name is Microporella verrucosa (Peach, 1868).
Dondice banyulensis Portmann & Sandmeier, 1960 is no longer accepted, the accepted name is Nemesignis banyulensis (Portmann & Sandmeier, 1960).
Facelina quatrefagesi (Vayssière, 1888) is no longer accepted, the accepted name is Caloria quatrefagesi (Vayssière, 1888).
Gobiusculus flavescens (Fabricius, 1779) is no longer accepted, the accepted name is Pomatoschistus flavescens (Fabricius, 1779).
Phrynorhombus norvegicus (Günther, 1862) is no longer accepted, the accepted name is Zeugopterus norvegicus (Günther, 1862).
Tritonia lineata Alder & Hancock, 1848 is no longer accepted, the accepted name is Duvaucelia lineata (Alder & Hancock, 1848).
Tritonia manicata Deshayes, 1853 is no longer accepted, the accepted name is Duvaucelia manicata (Deshayes, 1853).
Tritonia nilsodhneri Marcus Ev., 1983 is no longer accepted, the accepted name is Duvaucelia odhneri J. Tardy, 1963.
Tritonia striata Haefelfinger, 1963 is no longer accepted, the accepted name is Duvaucelia striata (Haefelfinger, 1963).

2020 update:

Eubranchus farrani (Alder & Hancock, 1844) is no longer accepted, the accepted name is Amphorina farrani (Alder & Hancock, 1844).
Eubranchus pallidus (Alder & Hancock, 1842) is no longer accepted, the accepted name is Amphorina pallida (Alder & Hancock, 1842).
Cystoseira baccata (S.G.Gmelin) P.C.Silva, 1952 is no longer accepted, the accepted name is Treptacantha baccata (S.G.Gmelin) Orellana & Sansón, 2019.
Ophioderma longicauda (Bruzelius, 1805) is no longer accepted, the accepted name is Ophioderma longicaudum (Bruzelius, 1805).
Pestarella tyrrhena (Petagna, 1792) is no longer accepted, the accepted name is Gilvossius tyrrhenus (Petagna, 1792).
Pteroeides spinosum (Ellis, 1764) is no longer accepted, the accepted name is Pteroeides griseum (Bohadsch, 1761).
Sagartia elegans (Dalyell, 1848) is no longer accepted, the accepted name is Cylista elegans (Dalyell, 1848).
Sagartia troglodytes (Price in Johnston, 1847) is no longer accepted, the accepted name is Cylista troglodytes (Price in Johnston, 1847).
Sagartiogeton undatus (Müller, 1778) is no longer accepted, the accepted name is Cylista undata (Müller, 1778).
Stelligera rigida (Montagu, 1814) is no longer accepted, the accepted name is Stelligera montagui Van Soest & Hooper, 2020.
Ulosa stuposa (Esper, 1794) is no longer accepted, the accepted name is Ulosa digitata (Schmidt, 1866).

2019 update:

Aiptasiogeton pellucidus (Hollard, 1848) is no longer accepted, the accepted name is Aiptasiogeton hyalinus (Delle Chiaje, 1822).
Chiton olivaceus Spengler, 1797 is no longer accepted, the accepted name is Rhyssoplax olivacea (Spengler, 1797).
Greilada elegans Bergh, 1894 is no longer accepted, the accepted name is Polycera elegans (Bergh, 1894).
Raphitoma concinna (Scacchi, 1836) is no longer accepted, the accepted name is Leufroyia concinna (Scacchi, 1836).
Swiftia pallida Madsen, 1970 is no longer accepted, the accepted name is Swiftia dubia (Thomson, 1929).
Tritia pygmaea (Lamarck, 1822) is no longer accepted, the accepted name is Tritia varicosa (W. Turton, 1825).
Turritella communis Risso, 1826 is no longer accepted, the accepted name is Turritellinella tricarinata (Brocchi, 1814).