# Halecium

Halecium is a genus of hydrozoans in the family Haleciidae. These marine invertebrates are found in all oceans, where they often form large colonies.

## Species

Halecium currently contains 135 confirmed species.
* Halecium amphibolum Watson, 1993
* Halecium annulatum Torrey, 1902
* Halecium annuliforme Galea & Schories, 2012
* Halecium antarcticum Vanhöffen, 1910
* Halecium arcticum Ronowicz & Schuchert, 2007
* Halecium argentum Clarke, 1894
* Halecium articulosum Clark, 1875
* Halecium banyulense Motz-Kossowska, 1912
* Halecium banzare Watson, 2008
* Halecium beanii (Johnston, 1838)
* Halecium bermudense Congdon, 1907
* Halecium birulai Spassky, 1929
* Halecium bithecum Watson, 2005
* Halecium brashnikowi Linko, 1911
* Halecium brevithecum Watson, 2008
* Halecium bruniensis Watson, 1975
* Halecium calderi Galea, 2010
* Halecium conicum Stechow, 1919
* Halecium corrugatissimum Trebilcock, 1928
* Halecium corrugatum Nutting, 1899
* Halecium crinis Stechow, 1913
* Halecium curvicaule Lorenz, 1886
* Halecium cymiforme Allman, 1888
* Halecium cymosum Fraser, 1935
* Halecium delicatulum Coughtrey, 1876
* Halecium densum Calkins, 1899
* Halecium dichotomum Allman, 1888
* Halecium diminutivum Fraser, 1942
* Halecium discoidum Galea, 2013
* Halecium dubium Fraser, 1941
* Halecium dufresnae Millard, 1977
* Halecium dyssymetrum Billard, 1929
* Halecium edwardsianum (d'Orbigny, 1842)
* Halecium elegantulum Watson, 2008
* Halecium erratum Galea, Försterra, Häussermann & Schories, 2014
* Halecium exaggeratum Peña Cantero, Boero & Piraino, 2013
* Halecium exiguum Fraser, 1948
* Halecium expansum Trebilcock, 1928
* Halecium fasciculatum Fraser, 1938
* Halecium fijiensis Watson, 2015
* Halecium filicula Allman, 1877
* Halecium fjordlandicum Galea, 2007
* Halecium flabellatum Fraser, 1935
* Halecium flexum Fraser, 1948
* Halecium fragile Hodgson, 1950
* Halecium fraseri Ralph, 1958
* Halecium frigidum Peña Cantero, 2010
* Halecium galeatum Billard, 1937
* Halecium groenlandicum Kramp, 1911
* Halecium halecinum (Linnaeus, 1758)
* Halecium harrimani Nutting, 1901
* Halecium humeriformis Galea & Schories, 2014
* Halecium humile Pictet, 1893
* Halecium incertus Naumov & Stepanjants, 1962
* Halecium inhacae Millard, 1958
* Halecium insolens Fraser, 1938
* Halecium interpolatum Ritchie, 1907
* Halecium irregulare Bonnevie, 1899
* Halecium jaederholmi Vervoort, 1972
* Halecium kofoidi Torrey, 1902
* Halecium labiatum Billard, 1933
* Halecium labrosum Alder, 1859
* Halecium laeve Kramp, 1932
* Halecium lamourouxianum (d'Orbigny, 1842)
* Halecium lankesterii (Bourne, 1890)
* Halecium lenticulare Trebilcock, 1928
* Halecium lightbourni Calder, 1991
* Halecium linkoi Antsulevich, 1980
* Halecium liouvillei Billard, 1934
* Halecium lucium Antsulevich, 1979
* Halecium luteum Watson, 1975
* Halecium macrocaulus Watson, 2008
* Halecium macrocephalum Allman, 1877
* Halecium marsupiale Bergh, 1887
* Halecium maximum Galea & Schories, 2014
* Halecium mediterraneum Weismann, 1883
* Halecium minutum Broch, 1903
* Halecium mirabile Schydlowsky, 1902
* Halecium mirandus Antsulevich & Regel, 1986
* Halecium modestum Galea & Schories, 2014
* Halecium muricatum (Ellis & Solander, 1786)
* Halecium mutilum Allman, 1876
* Halecium nanum Alder, 1859
* Halecium nullinodum Fraser, 1935
* Halecium obovatum Watson, 2018
* Halecium ochotense Linko, 1911
* Halecium ornatum Nutting, 1901
* Halecium ovatum Totton, 1930
* Halecium pallens Jäderholm, 1904
* Halecium paucinodum (Fraser, 1947)
* Halecium pearsonenese Watson, 1997
* Halecium perexiguum Hirohito, 1995
* Halecium permodicum Calder, 2017
* Halecium petrosum Stechow, 1919
* Halecium planum Bonnevie, 1901
* Halecium platythecum Galea, Försterra & Häussermann, 2014
* Halecium plicatocarpum Vervoort & Watson, 2003
* Halecium plicatum Galea, 2015
* Halecium plumosum Hincks, 1868
* Halecium praeparvum Calder, 2017
* Halecium profundum Calder & Vervoort, 1998
* Halecium pseudodelicatulum Peña Cantero, 2014
* Halecium pseudoincertus Peña Cantero, 2014
* Halecium pusillum (Sars, 1857)
* Halecium pyriform Hirohito, 1995
* Halecium ralpha Watson & Vervoort, 2001
* Halecium reduplicatum (Fraser, 1935)
* Halecium regulare Fraser, 1938
* Halecium reversum Nutting, 1901
* Halecium scalariformis Billard, 1929
* Halecium scandens Nutting, 1906
* Halecium scutum Clark, 1977
* Halecium secundum Jäderholm, 1904
* Halecium sessile Norman, 1867
* Halecium sibogae Billard, 1929
* Halecium singulare (Billard, 1929)
* Halecium spatulum Watson, 2000
* Halecium speciosum Nutting, 1901
* Halecium stoloniferum Soto Angel & Peña Cantero, 2015
* Halecium tabulatum Watson, 2005
* Halecium tangaroa Peña Cantero, 2017
* Halecium telescopicum Allman, 1888
* Halecium tenellum Hincks, 1861
* Halecium tensum Fraser, 1941
* Halecium tenue Fraser, 1938
* Halecium textum Kramp, 1911
* Halecium tortile Bonnevie, 1898
* Halecium tortum Fraser, 1938
* Halecium tristaniensis Galea, 2014
* Halecium tubatum Watson, 2008
* Halecium undulatum Billard, 1921
* Halecium vagans Fraser, 1938
* Halecium vasiforme Fraser, 1935
* Halecium wilsoni Calkins, 1899
* Halecium xanthellatum Galea, 2013