Acontiaria Stephenson, 1935 (basis of record)
Actinauge cristata Riemann-Zürneck, 1986 (additional source)
Actinauge longicornis (Verrill, 1882) (basis of record)
Actinauge rugosa Verrill, 1922 accepted as Hormathia nodosa (Fabricius, 1780) (source of synonymy)
Actinauge verrilli McMurrich, 1893 accepted as Actinauge verrillii McMurrich, 1893 (basis of record)
Actinauge verrillii McMurrich, 1893 (basis of record)
Actinernidae Stephenson, 1922 (additional source)
Actinernus nobilis Verrill, 1879 (basis of record)
Actinia nitida Dawson, 1858 accepted as Stomphia coccinea (Müller, 1776) (basis of record)
Actinia obtruncata Stimpson, 1853 (additional source)
Actinia sipunculoides Stimpson, 1853 accepted as Edwardsia sipunculoides (Stimpson, 1853) (source of synonymy)
Actiniaria (additional source)
Actinioidea Rafinesque, 1815 (basis of record)
Actinostola callosa (Verrill, 1882) (additional source)
Actinostola groenlandica Carlgren, 1899 (additional source)
Actinostola spetsbergensis Carlgren, 1893 accepted as Glandulactis spetsbergensis (Carlgren, 1893) (basis of record)
Actinothoe modesta (Verrill, 1866) (additional source)
Adamsia sociabilis Verrill, 1882 accepted as Calliactis sociabilis (Verrill, 1882) (basis of record)
Allantactis parasitica Danielssen, 1890 (additional source)
Amphianthus mirabilis (Verrill, 1879) (basis of record)
Antholoba achates (Drayton in Dana, 1846) (additional source)
Antholoba perdix (Verrill, 1882) (basis of record)
Arachnactidae McMurrich, 1910 (additional source)
Arachnactis Sars, 1846 (additional source)
Athenaria (basis of record)
Aulactinia stella (Verrill, 1864) (additional source)
Bolocera tuediae (Johnston, 1832) (additional source)
Bunodactis stella (Verrill, 1864) accepted as Aulactinia stella (Verrill, 1864) (basis of record)
Ceriantharia (additional source)
Ceriantheopsis americana (Agassiz in Verrill, 1864) (additional source)
Cerianthidae Milne Edwards & Haime, 1851 (additional source)
Diadumene leucolena (Verrill, 1866) (additional source)
Diadumene lineata (Verrill, 1869) (basis of record)
Drillactis Verrill, 1922 (basis of record)
Drillactis pallida (Verrill, 1880) (additional source)
Edwardsia elegans Verrill, 1869 (additional source)
Edwardsia farinacea Verrill, 1869 accepted as Halcampa duodecimcirrata (Sars, 1851) (source of synonymy)
Edwardsia lineata (Verrill in Baird, 1873) accepted as Edwardsiella lineata (Verrill in Baird, 1873) (additional source)
Edwardsia sipunculoides (Stimpson, 1853) (additional source)
Edwardsiella lineata (Verrill in Baird, 1873) (additional source)
Endocoelantheae accepted as Actinernoidea Stephenson, 1922 (basis of record)
Endomyaria Stephenson, 1921 (basis of record)
Epiactis fecunda (Verrill, 1899) accepted as Urticina fecunda (Verrill, 1899) (additional source)
Epizoanthus americanus Verrill, 1864 accepted as Epizoanthus papillosus Johnston, 1842 (additional source)
Epizoanthus cancrisocius Martens, 1876 (basis of record)
Epizoanthus paguriphilus Verrill, 1883 (additional source)
Glandulactis spetsbergensis (Carlgren, 1893) (additional source)
Gonactinia prolifera (Sars, 1835) (additional source)
Halcampa anomala Verrill, 1922 (additional source)
Halcampa arctica Carlgren, 1893 (additional source)
Halcampa duodecimcirrata (Sars, 1851) (additional source)
Haliplanella lineata (Verrill, 1869) accepted as Diadumene lineata (Verrill, 1869) (additional source)
Haloclava producta (Stimpson, 1856) (additional source)
Hexacorallia (additional source)
Hormathia digitata (O.F. Müller, 1776) (additional source)
Hormathia nodosa (Fabricius, 1780) (additional source)
Liponema multicorne (Verrill, 1880) (basis of record)
Liponema multicornis (Verrill, 1880) accepted as Liponema multicorne (Verrill, 1880) (additional source)
Mesacmaea laevis (Verrill, 1864) (additional source)
Mesomyaria Stephenson, 1921 accepted as Actinostoloidea Carlgren, 1932 (basis of record)
Metridioidea Carlgren, 1893 (basis of record)
Metridium dianthus (Ellis, 1768) (basis of record)
Metridium marginatum Milne-Edwards accepted as Metridium dianthus (Ellis, 1768) (basis of record)
Metridium senile (Linnaeus, 1761) (additional source)
Nematostella vectensis Stephenson, 1935 (additional source)
Paracalliactis consors (Verrill, 1882) (additional source)
Paranthus rapiformis (Le Sueur, 1817) (additional source)
Peachia parasitica (Agassiz, 1861) (additional source)
Penicillaria (basis of record)
Sagartiogeton verrilli Carlgren, 1942 (additional source)
Spirularia (basis of record)
Stephanauge abyssicola (Moseley, 1877) (basis of record)
Stephanauge nexilis (Verrill, 1883) (additional source)
Stomphia carneola (Stimpson, 1853) accepted as Stomphia coccinea (Müller, 1776) (additional source)
Stomphia coccinea (Müller, 1776) (additional source)
Synarachnactis Carlgren, 1924 (basis of record)
Tealia felina (Linnaeus, 1767) accepted as Urticina felina (Linnaeus, 1761) (additional source)
Thenaria (basis of record)
Urticina consors Verrill, 1882 accepted as Paracalliactis consors (Verrill, 1882) (source of synonymy)
Urticina crassicornis (Müller, 1776) (additional source)
Urticina felina (Linnaeus, 1761) (additional source)

 Homonymy

 for Actinia striata Quoy & Gaimard, 1833

Junior primary homonym of *Actinia striata* Risso, 1826 (type of *Paractinia*) [details]

 Homonymy

 for Actinia striata Rizzi, 1907

Junior primary homonym of *Actinia striata* Risso, 1826 (type of *Paractinia*), and of Quoy and Gaimard, 1833 [details]

 Synonymy

 for Anemonia melanaster (Verrill, 1901)

Status of the species needs investigation [details]

 Taxonomy

 for Corynactis albida Agassiz, 1859

This is not considered a valid species. The name has been applied to two species: Haloclava producta (Stimpson, ... [details]

 Validity

 for Boloceroides hermaphroditica Carlgren, 1900

Possible synonym of Bolocera mcmurrichi. [details]

 Validity

 for Edwardsioides mamillata (Bourne, 1916)

nomen dubium according to Williams, 1981 [details]

 Validity

 for Euphellia cinclidifera Pax, 1908

Also treated as a synonym of Telmatactis cricoides (Duchassaing, 1850). [details]