Acontiaria Stephenson, 1935 (additional source)
Actiniaria (additional source)
Actiniidae Rafinesque, 1815 (additional source)
Actinostola Verrill, 1883 (additional source)
Actinostola callosa (Verrill, 1882) (additional source)
Actinostolidae Carlgren, 1932 (additional source)
Antholoba Hertwig, 1882 (additional source)
Antholoba achates (Drayton in Dana, 1846) (additional source)
Anthosactis Danielssen, 1890 (additional source)
Athenaria (additional source)
Bolocera Gosse, 1860 (additional source)
Bolocera tuediae (Johnston, 1832) (additional source)
Cactosoma Danielssen, 1890 (additional source)
Cactosoma abyssorum Danielssen, 1890 (additional source)
Cribrinopsis Carlgren, 1921 (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)
Endomyaria Stephenson, 1921 (additional source)
Epiactis Verrill, 1869 (additional source)
Epiactis arctica (Verrill, 1868) (additional source)
Epiactis incerta Carlgren, 1921 (additional source)
Epiactis lewisi Carlgren, 1940 (additional source)
Epiactis marsupialis Carlgren, 1901 (additional source)
Gonactinia Sars, 1851 (additional source)
Gonactinia prolifera (Sars, 1835) (additional source)
Gonactiniidae Carlgren, 1893 (additional source)
Halcampa Gosse, 1858 (additional source)
Halcampa arctica Carlgren, 1893 (additional source)
Halcampidae Andres, 1883 (additional source)
Halcampoides Danielssen, 1890 (additional source)
Halcampoides purpurea (Studer, 1879) accepted as Halcampoides purpureus (Studer, 1879) (additional source)
Halcampoididae Appellöf, 1896 (additional source)
Haliactiidae Carlgren, 1949 accepted as Haliactinidae Carlgren, 1949 (original description)
Haliactis Carlgren, 1921 (additional source)
Haliactis arctica Carlgren, 1921 (additional source)
Hormathia Gosse, 1859 (additional source)
Hormathia digitata (O.F. Müller, 1776) (additional source)
Hormathiidae Carlgren, 1932 (additional source)
Limnactinia Carlgren, 1921 (additional source)
Limnactinia laevis Carlgren, 1921 (additional source)
Limnactiniidae Carlgren, 1921 (additional source)
Liponema Hertwig, 1882 (additional source)
Liponema multicornis (Verrill, 1880) accepted as Liponema multicorne (Verrill, 1880) (additional source)
Mesomyaria Stephenson, 1921 accepted as Actinostoloidea Carlgren, 1932 (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 nathorsti (Carlgren, 1921) accepted as Nematostella nathorstii (Carlgren, 1921) (additional source)
Nematostella polaris (Carlgren, 1921) (additional source)
Nynantheae accepted as Enthemonae (additional source)
Paraedwardsia Carlgren in Nordgaard, 1905 (additional source)
Paraedwardsia arenaria Carlgren in Nordgaard, 1905 (additional source)
Protantheae accepted as Gonactiniidae Carlgren, 1893 (additional source)
Ptychodactiidae Appellöf, 1893 accepted as Ptychodactinidae Appellöf, 1893 (additional source)
Ptychodactis Appellöf, 1893 (additional source)
Ptychodactis patula Appellöf, 1893 (additional source)
Pycnanthus McMurrich, 1893 (additional source)
Pycnanthus densus Carlgren, 1921 (additional source)
Stomphia (Gosse, 1859) (additional source)
Stomphia coccinea (Müller, 1776) (additional source)
Tealia Gosse, 1858 (additional source)
Thenaria (additional source)