Hydractinia is een geslacht van neteldieren uit de familie van de Hydractiniidae.
Soorten Hydractinia aculeata (Wagner, 1833) Hydractinia aggregata Fraser, 1911 Hydractinia altispina Millard, 1955 Hydractinia anechinata (Ritchie, 1907) Hydractinia angusta Hartlaub, 1904 Hydractinia apicata (Kramp, 1959) Hydractinia arctica (Jäderholm, 1902) Hydractinia arge (Clarke, 1882) Hydractinia armata Fraser, 1940 Hydractinia bayeri Hirohito, 1984 Hydractinia betkensis (Watson, 1978) Hydractinia brachyurae (Hirohito, 1988) Hydractinia californica Torrey, 1904 Hydractinia canalifera Millard, 1957 Hydractinia carica Bergh, 1887 Hydractinia carolinae Fraser, 1912 Hydractinia cryptogonia Hirohito, 1988 Hydractinia cytaeiformis Vervoort, 2006 Hydractinia denhami (Thornely, 1904) Hydractinia diogenes Millard, 1959 Hydractinia disjuncta Fraser, 1938 Hydractinia dongshanensis Xu & Huang, 2006 Hydractinia echinata (Fleming, 1828) Hydractinia epidocleensis Leloup, 1931 Hydractinia epispongia Fraser, 1938 Hydractinia gorgonoides (Nutting, 1906) Hydractinia granulata Hirohito, 1988 Hydractinia guangxiensis Huang, Li & Zhang, 2010 Hydractinia hancocki Fraser, 1938 Hydractinia inabai (Hirohito, 1988) Hydractinia ingolfi Kramp, 1932 Hydractinia kaffraria Millard, 1955 Hydractinia laevispina Fraser, 1922 Hydractinia longispina Fraser, 1938 Hydractinia mar (Gasco & Calder, 1993) Hydractinia marsupialia Millard, 1975 Hydractinia meteoris (Thiel, 1938) Hydractinia michaelseni Broch, 1914 Hydractinia minoi (Alcock, 1892) Hydractinia moniliformis Huang, Zhong & Zhang, 2010 Hydractinia monocarpa Allman, 1876 Hydractinia monoon (Hirohito, 1988) Hydractinia multispina Fraser, 1938 Hydractinia multitentaculata (Millard, 1975) Hydractinia munita (Calder, 2010) Hydractinia nagaoensis Bouillon, Medel & Peña Cantero, 1997 Hydractinia novaezelandiae Schuchert, 1996 Hydractinia ocalana (Brooks, 1964) † Hydractinia 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, 1862 Hydractinia polytentaculata Xu & Huang, 2006 Hydractinia proboscidea (Hincks, 1868) Hydractinia prolifica Fraser, 1948 Hydractinia promiscua Galea & Ferry, 2015 Hydractinia quadrigemina Fraser, 1938 Hydractinia recurvatus Lin, Xu, Huang & Wang, 2010 Hydractinia rugosa Fraser, 1938 Hydractinia sarsii (Steenstrup, 1850) Hydractinia spinipapillaris (Hirohito, 1988) Hydractinia spiralis Goto, 1910 Hydractinia symbiolongicarpus Buss & Yund, 1989 Hydractinia symbiopollicaris Buss & Yund, 1989 Hydractinia thatcheri Chapman, 1931 † Hydractinia uniformis Stampar, Tronolone & Morandini, 2006 Hydractinia vacuolata Xu & Huang, 2006 Hydractinia valens Fraser, 1943 Hydractinia vallini Jäderholm, 1926 Hydractinia verdi Ritchie, 1907 Hydractinia yerii (Iwasa, 1934)
Categorie:Hydractiniidae