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 A large, colonial hydroid that grows up to 20 cm high, with broad unbranched stems. The side branches are long and straight in alternating series on opposite sides giving a feather-like colony. The colour of living specimens is brown with a green tinge due to zooxanthellae. The feeding polyps are borne in a single series along the side branches, each surrounded by three defensive polyps. The hydrothecae, a supporting, nonliving, protein-chitinous envelope surrounding the stalk, is slightly broader than long and the rim has nine projecting teeth. The corbula or basket is up to 3 mm long, at the base of the branch, close to the main stem with up to ten per stem. Some of the ribs forming the basket are unfused leaving open gaps.


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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