URMO Taxon list
Bouillonactinia carcinicola (Hiro, 1939)
Bouillonactinia hooperii (Sigerfoos, 1899)
Bouillonactinia misakiensis (Iwasa, 1934)
Bouillonactinia multigranosi (Namikawa, 1991)
Cionistes reticulata Wright, 1861 accepted as Hydractinia reticulata (Wright, 1861)
Clava leptostyla L. Agassiz, 1862 accepted as Clava multicornis (Forsskål, 1775)
Clava multicornis (Forsskål, 1775)
Clava nana Motz-Kossowska, 1905 (uncertain > taxon inquirendum )
Clavactinia gallensis Thornely, 1904
Clavactinia protecta (Schuchert, 1996) accepted as Fiordlandia protecta Schuchert, 1996
Clavactinia rubricata (Schuchert, 1996)
Clavactinia serrata (Kramp, 1943)
Cnidostoma fallax Vanhöffen, 1911
Cystactinia ocalana Brooks, 1964 † (unaccepted > interim unpublished )
Dysmorphosa minuta Mayer, 1900 accepted as Lizzia blondina Forbes, 1848
Fiordlandia protecta Schuchert, 1996
Hydractinia aculeata (Wagner, 1833)
Hydractinia aggregata Fraser, 1911
Hydractinia allmanii Bonnevie, 1898 accepted as Schuchertinia allmanii (Bonnevie, 1898)
Hydractinia altispina Millard, 1955
Hydractinia americana (Mayer, 1910) accepted as Podocoryna americana (Mayer, 1910)
Hydractinia angusta Hartlaub, 1904
Hydractinia apicata (Kramp, 1959) accepted as Podocoryna apicata Kramp, 1959
Hydractinia arctica (Jäderholm, 1902)
Hydractinia areolata Alder, 1862 accepted as Podocoryna areolata (Alder, 1862)
Hydractinia arge (Clarke, 1882)
Hydractinia armata Fraser, 1940
Hydractinia australis (Schuchert, 1996) accepted as Podocoryna australis Schuchert, 1996
Hydractinia bayeri Hirohito, 1984
Hydractinia bella (Hand, 1961) accepted as Podocoryna bella Hand, 1961
Hydractinia betkensis (Watson, 1978)
Hydractinia borealis (Mayer, 1900) accepted as Podocoryna borealis (Mayer, 1900)
Hydractinia brachyurae (Hirohito, 1988)
Hydractinia calderi Bouillon, Medel & Peña Cantero, 1997 accepted as Hydractinia proboscidea (Hincks, 1868)
Hydractinia californica Torrey, 1904
Hydractinia canalifera Millard, 1957
Hydractinia carcinicola (Hiro, 1939) accepted as Bouillonactinia carcinicola (Hiro, 1939)
Hydractinia carica Bergh, 1887
Hydractinia carnea (M. Sars, 1846) accepted as Podocoryna carnea M. Sars, 1846
Hydractinia carolinae Fraser, 1912
Hydractinia claviformis (Bouillon, 1965) accepted as Hydractinia proboscidea (Hincks, 1868)
Hydractinia conchicola (Yamada, 1947) accepted as Schuchertinia conchicola (Yamada, 1947)
Hydractinia cryptogonia Hirohito, 1988
Hydractinia dendritica Hickson & Gravely, 1907
Hydractinia diogenes Millard, 1959
Hydractinia disjuncta Fraser, 1938
Hydractinia dubia (Mayer, 1900) accepted as Podocoryna dubia (Mayer, 1900)
Hydractinia echinata (Fleming, 1828)
Hydractinia epiconcha Stechow, 1908 accepted as Schuchertinia epiconcha (Stechow, 1908)
Hydractinia epispongia Fraser, 1938
Hydractinia exigua (Haeckel, 1880) accepted as Podocoryna exigua (Haeckel, 1880)
Hydractinia fallax Broch, 1914 accepted as Perarella fallax (Broch, 1914)
Hydractinia fucicola (Sars, 1857) accepted as Stylactis fucicola (M. Sars, 1857)
Hydractinia granulata Hirohito, 1988
Hydractinia hancocki Fraser, 1938
Hydractinia hayamaensis (Hirohito, 1988) accepted as Podocoryna hayamaensis Hirohito, 1988
Hydractinia hooperii (Sigerfoos, 1899) accepted as Bouillonactinia hooperii (Sigerfoos, 1899)
Hydractinia humilis Bonnevie, 1898 (uncertain > taxon inquirendum )
Hydractinia inabai (Hirohito, 1988) accepted as Bouillonactinia misakiensis (Iwasa, 1934)
Hydractinia inermis (Allman, 1872) accepted as Stylactis inermis Allman, 1872
Hydractinia ingolfi (Kramp, 1932)
Hydractinia kaffraria Millard, 1955
Hydractinia laevispina Fraser, 1922
Hydractinia longispina Fraser, 1938
Hydractinia mar (Gasca & Calder, 1993)
Hydractinia marsupialia Millard, 1975
Hydractinia meteoris (Thiel, 1938) accepted as Paracytaeis meteoris (Thiel, 1938)
Hydractinia milleri Torrey, 1902 accepted as Schuchertinia milleri (Torrey, 1902)
Hydractinia minoi (Alcock, 1892)
Hydractinia misakiensis (Iwasa, 1934) accepted as Bouillonactinia misakiensis (Iwasa, 1934)
Hydractinia monocarpa Allman, 1876
Hydractinia monoon (Hirohito, 1988)
Hydractinia multigranosi (Namikawa, 1991) accepted as Bouillonactinia multigranosi (Namikawa, 1991)
Hydractinia multispina Fraser, 1938
Hydractinia multitentaculata (Millard, 1975)
Hydractinia nagaoensis Bouillon, Medel & Peña Cantero, 1997
Hydractinia nassa (Millard, 1959) accepted as Cytaeis nassa (Millard, 1959)
Hydractinia novaezelandiae Schuchert, 1996
Hydractinia ocellata (Agassiz & Mayer, 1902) accepted as Podocoryna ocellata (Agassiz & Mayer, 1902)
Hydractinia otagoensis (Schuchert, 1996)
Hydractinia pacifica Hartlaub, 1905
Hydractinia parvispina Hartlaub, 1905
Hydractinia paucispinata Vervoort, 2006
Hydractinia phialiformis (Antsulevich, 1983)
Hydractinia piscicola (Komai, 1932)
Hydractinia polycarpa Fraser, 1938
Hydractinia polyclina L. Agassiz, 1860
Hydractinia proboscidea (Hincks, 1868)
Hydractinia prolifica Fraser, 1948 accepted as Hydractinia rugosa Fraser, 1938
Hydractinia pruvoti Motz-Kossowska, 1905 accepted as Podocoryna pruvoti (Motz-Kossowska, 1905)
Hydractinia quadrigemina Fraser, 1938
Hydractinia reticulata (Wright, 1861) (uncertain > taxon inquirendum )
Hydractinia rubricata Schuchert, 1996 accepted as Clavactinia rubricata (Schuchert, 1996)
Hydractinia rugosa Fraser, 1938
Hydractinia sandrae (Wedler & Larson, 1986)
Hydractinia sarsii (Steenstrup, 1850)
Hydractinia selena (Mills, 1976) accepted as Hydractinia americana (Mayer, 1910) accepted as Podocoryna americana (Mayer, 1910)
Hydractinia serrata Kramp, 1943 accepted as Clavactinia serrata (Kramp, 1943)
Hydractinia siphonis (Stechow, 1921) (uncertain > taxon inquirendum )
Hydractinia sodalis Stimpson, 1858 accepted as Hydrissa sodalis (Stimpson, 1858)