Acontiaria Stephenson, 1935 accepted as Metridioidea Rodríguez & Daly in Rodríguez et al., 2014 accepted as Metridioidea Carlgren, 1893 (additional source)
Actiniaria (additional source)
Actiniidae Rafinesque, 1815 (additional source)
Aiptasia Gosse, 1858 (additional source)
Aiptasia diaphana (Rapp, 1829) accepted as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasia pulchella Carlgren, 1943 accepted as Exaiptasia pallida (Agassiz in Verrill, 1864) represented as Exaiptasia diaphana (Rapp, 1829) (additional source)
Aiptasiidae Carlgren, 1924 (additional source)
Anemonia Risso, 1827 (additional source)
Athenaria accepted as Actiniaria incertae sedis (additional source)
Bunodosoma Verrill, 1899 (additional source)
Cereus pedunculatus (Pennant, 1777) (additional source)
Diadumene Stephenson, 1920 (additional source)
Diadumene cincta Stephenson, 1925 (additional source)
Diadumene leucolena (Verrill, 1866) (additional source)
Diadumenidae Stephenson, 1920 (additional source)
Metridiidae Carlgren, 1893 (additional source)
Metridium de Blainville, 1824 (additional source)
Metridium senile (Linnaeus, 1761) (additional source)
Nematostella Stephenson, 1935 (additional source)
Nematostella vectensis Stephenson, 1935 (additional source)
Nynantheae accepted as Enthemonae (additional source)
Sagartia Gosse, 1855 (additional source)
Sagartia elegans (Dalyell, 1848) accepted as Cylista elegans (Dalyell, 1848) (additional source)
Sagartiidae Gosse, 1858 (additional source)
Thenaria accepted as Actiniaria incertae sedis (additional source)