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Sea Thread Hydroid
Obelia dichotoma (Linnaeus 1758)
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Invertebrates of the Salish Sea
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Invertebrates of the Salish Sea
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Freshwater and Marine Image Bank U Washington
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Image of Sea thread hydroid
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Rosario Beach Marine Laboratory
Invertebrates of the Salish Sea
A closeup of the colony, showing the brown perisarc on older sections and the bell-shaped hydrotheca around each hydranth.
Image of Sea thread hydroid
cc-by-nc-sa
Rosario Beach Marine Laboratory
Invertebrates of the Salish Sea
Obelia dichotoma
, about 9 cm long. (Photo by: Dave Cowles, August 2006)