title: Hydractinia
text: # 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)
  