Species under Obelia
n= 9
Species name Common name Distribution Max. Length (cm)
Obelia austrogeorgiae
Jäderholm, 1905
Antarctic Atlantic
Obelia bidentata
Clark, 1875
Doubletoothed hydroid Antarctic, Atlantic, Pacific and Arctic Oceans
Obelia dichotoma
(Linnaeus, 1758)
Sea thread hydroid Arctic, Atlantic, Indo-Pacific
Obelia fimbriata
(Dalyell, 1848)
Northeast Atlantic
Obelia geniculata
(Linnaeus, 1758)
Knotted thread hydroid Indo-Pacific, Atlantic Ocean, Antarctic, and the Arctic
Obelia longissima
(Pallas, 1766)
Cosmopolitan
Obelia multidentata
Fraser, 1914
Eastern Pacific
Obelia plicata
Hincks, 1868
Atlantic, Pacific and Arctic Oceans
Obelia racemosa
Fraser, 1941
Western Atlantic
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