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This is a feather-like species which grows in clusters, often on the brown seaweed Halidrys siliquosa but also on rock surfaces in shallow water. The central stem bears alternating unbranched side branches with polyps all facing upwards. Each feeding polyp is surrounded by three defensive polyps. The reproductive polyps are enclosed in a basket-like corbula, which replaces a normal side branch. The colony is brown in colour. Typically 3-4 cm in height by 1 cm wide. All Aglaophenia species are similar to each other, as is Gymnangium montagui.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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