Species under Halecium
n= 50
Species name Common name Distribution Max. Length (cm)
Halecium annulatum
Torrey, 1902
Eastern Pacific
Halecium arcticum
Ronowicz & Schuchert, 2007
Northeast Atlantic
Halecium articulosum
Clark, 1875
Atlantic and Pacific Oceans
Halecium beanii
(Johnston, 1838)
thornbush hydroid Atlantic and Pacific Oceans
Halecium bermudense
Congdon, 1907
Western Atlantic
Halecium capillare
(Pourtales, 1907)
Western Atlantic
Halecium corrugatum
Nutting, 1899
Atlantic, Pacific and Arctic Oceans
Halecium curvicaule
von Lorenz, 1886
Atlantic and Arctic Oceans
Halecium delicatulum
Coughtrey, 1876
delicate hydroid Cosmopolitan
Halecium densum
Calkins, 1899
dense bushy hydroid Eastern Pacific
Halecium dichotomum
Allman, 1888
Southwest Atlantic
Halecium diminutivum
Fraser, 1940
Western Atlantic
Halecium dyssymetrum
Billard, 1929
Western Atlantic
Halecium dysymmetrum
Billard, 1929
Southwest Atlantic
Halecium filicula
Allman, 1877
Western Central Atlantic
Halecium fjordlandicum
Galea, 2007
fjord sapling Southeast Pacific
Halecium fraseri
Ralph, 1958
Southeast Pacific
Halecium fruticosum
Fraser, 1943
Western Atlantic
Halecium groenlandicum
Kramp, 1911
Atlantic and Arctic Oceans
Halecium halecinum
(Linnaeus, 1758)
herringbone hydroid Atlantic and Pacific Oceans
Halecium incertus
Naumov & Stepan'yants, 1962
Antarctic, Kerguélen and Bouvet
Halecium insolens
Fraser, 1938
Eastern Pacific
Halecium jaederholmi
Vervoort, 1972
Antarctic Atlantic
Halecium kofoidi
Torrey, 1902
Eastern Pacific
Halecium labrosum
Alder, 1859
Atlantic, Pacific and Arctic Oceans
Halecium lightbourni
Calder, 1991
Western Atlantic
Halecium macrocephalum
Allman, 1877
Atlantic and Pacific Oceans
Halecium minutum
Broch, 1903
Atlantic and Arctic Oceans
Halecium muricatum
(Ellis & Solander, 1786)
sea hedgehog hydroid Mediterranean, Atlantic, Pacific and Arctic Oceans
Halecium mutilum
Allman, 1876
Antarctic Indian Ocean
Halecium nanum
Alder, 1859
Mediterranean, Atlantic and Arctic Oceans
Halecium obovatum
Watson, 2018
Eastern Indian Ocean
Halecium ornatum
Nutting, 1901
Pacific and Arctic Oceans
Halecium ovatum
Totton, 1930
Southwest Pacific and Antarctic Atlantic
Halecium pallens
Jäderholm, 1904
Antarctic Atlantic
Halecium paucinodum
(Fraser, 1947)
Eastern Pacific
Halecium petrosum
Stechow, 1919
Mediterranean 19
Halecium pusillum
Sars, 1850
Mediterranean 27
Halecium pygmaeum
Fraser, 1911
Eastern Pacific
Halecium ralpha
Watson & Vervoort, 2001
Indo-West Pacific
Halecium reversum
Nutting, 1901
Eastern Pacific
Halecium scutum
Clark, 1877
Atlantic, Pacific and Arctic Oceans
Halecium sessile
Norman, 1867
Western Atlantic
Halecium speciosum
Nutting, 1901
Central and north Atlantic, Pacific and Arctic Oceans
Halecium telescopicum
Allman, 1888
Eastern Pacific
Halecium tenellum
Hincks, 1861
Atlantic, Pacific and Arctic Oceans
Halecium undulatum
Billard, 1921
Atlantic and Arctic Oceans
Halecium vagans
Fraser, 1938
Eastern Pacific
Halecium washingtoni
Nutting, 1899
Eastern Pacific
Halecium wilsoni
Calkins, 1899
Eastern Pacific
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