# Hydractinia

Hydractaria est un genre d'hydrozoaires de la famille des Hydractiniidae.

## Liste d'espèces

Selon World Register of Marine Species (19 août 2015) :
* Hydractinia aculeata (Wagner, 1833)
* Hydractinia aggregata Fraser, 1911
* Hydractinia alderi (Hodge, 1863)
* 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 dubia (Mayer, 1900)
* 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 humilis Bonnevie, 1898
* Hydractinia inabai (Hirohito, 1988)
* Hydractinia incerta Van Beneden, 1867
* 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 quadrigemina Fraser, 1938
* Hydractinia recurvatus Lin, Xu, Huang & Wang, 2010
* Hydractinia reticulata (Fraser, 1938)
* Hydractinia reticulata (Wright, 1861)
* Hydractinia rugosa Fraser, 1938
* Hydractinia sarsii (Steenstrup, 1850)
* Hydractinia siphonis (Stechow, 1921)
* Hydractinia solitaria Van Beneden, 1867
* Hydractinia spinipapillaris (Hirohito, 1988)
* Hydractinia spiralis Goto, 1910
* Hydractinia spiralis Lin, Xu, Huang & Wang, 2010
* Hydractinia symbiolongicarpus Buss & Yund, 1989
* Hydractinia symbiopollicaris Buss & Yund, 1989
* Hydractinia tenuissima Van Beneden, 1867
* 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)