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 A colonial hydroid comprising erect, slightly zigzag but slender main stems that grow up to about 15 cm. The lateral branches tend to be in pairs, successively on opposite sides of the stem. The minor branches are delicate. The hydrothecae, a supporting, nonliving, protein-chitinous envelope surrounding the stem, is elongate and bell-shaped.


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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