Acontiaria Stephenson, 1935 (basis of record)
Actiniaria (additional source)
Actinioidea Rafinesque, 1815 (basis of record)
Actinostola callosa (Verrill, 1882) (additional source)
Antholoba achates (Drayton in Dana, 1846) (additional source)
Anthosactis janmayeni Danielssen, 1890 (additional source)
Athenaria (basis of record)
Aulactinia spetsbergensis (Carlgren, 1921) (additional source)
Aulactinia stella (Verrill, 1864) (additional source)
Bolocera tuediae (Johnston, 1832) (additional source)
Cactosoma abyssorum Danielssen, 1890 (additional source)
Ceriantharia (additional source)
Cerianthidae Milne Edwards & Haime, 1851 (additional source)
Cribrinopsis similis Carlgren, 1921 (additional source)
Edwardsia andresi Danielssen, 1890 (additional source)
Edwardsia arctica Carlgren, 1921 (additional source)
Edwardsia finmarchica Carlgren, 1921 (additional source)
Edwardsia fusca Danielssen, 1890 (additional source)
Edwardsia vegae Carlgren, 1921 (additional source)
Edwardsiella carnea (Gosse, 1856) (additional source)
Edwardsiella loveni (Carlgren, 1892) (additional source)
Endomyaria Stephenson, 1921 (basis of record)
Epiactis arctica (Verrill, 1868) (additional source)
Epiactis incerta Carlgren, 1921 (additional source)
Epiactis lewisi Carlgren, 1940 (additional source)
Epiactis marsupialis Carlgren, 1901 (additional source)
Glandulactis spetsbergensis (Carlgren, 1893) (additional source)
Gonactinia prolifera (Sars, 1835) (additional source)
Halcampa arctica Carlgren, 1893 (additional source)
Halcampoides purpurea (Studer, 1879) accepted as Halcampoides purpureus (Studer, 1879) (additional source)
Halcampoides purpureus (Studer, 1879) (basis of record)
Haliactinidae Carlgren, 1949 (basis of record)
Haliactis arctica Carlgren, 1921 (additional source)
Hexacorallia (additional source)
Hormathia digitata (O.F. Müller, 1776) (additional source)
Limnactinia laevis Carlgren, 1921 (additional source)
Liponema multicorne (Verrill, 1880) (basis of record)
Liponema multicornis (Verrill, 1880) accepted as Liponema multicorne (Verrill, 1880) (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 senile (Linnaeus, 1761) (additional source)
Metridium senile senile (Linnaeus, 1761) accepted as Metridium senile (Linnaeus, 1761) (additional source)
Nematostella nathorsti (Carlgren, 1921) accepted as Nematostella nathorstii (Carlgren, 1921) (source of synonymy)
Nematostella nathorstii (Carlgren, 1921) (additional source)
Nematostella polaris (Carlgren, 1921) (additional source)
Paraedwardsia arenaria Carlgren in Nordgaard, 1905 (additional source)
Ptychodacteae accepted as Ptychodactinidae Appellöf, 1893 (basis of record)
Ptychodactiidae Appellöf, 1893 accepted as Ptychodactinidae Appellöf, 1893 (additional source)
Ptychodactinidae Appellöf, 1893 (basis of record)
Ptychodactis patula Appellöf, 1893 (additional source)
Pycnanthus densus Carlgren, 1921 (additional source)
Spirularia (basis of record)
Stomphia coccinea (Müller, 1776) (additional source)
Synarachnactis Carlgren, 1924 (basis of record)
Tealia crassicornis (Müller, 1776) accepted as Urticina crassicornis (Müller, 1776) (additional source)
Thenaria (basis of record)
Urticina crassicornis (Müller, 1776) (additional source)
Urticina felina (Linnaeus, 1761) (additional source)