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 The hydroid forms bushy, densely branched, 'tree-like' tufts, 2 -5 cm in height. The main stem is a dark horn in colour and composed of multiple tubes near the base of the colony (polysiphonic), becoming single tubed branches towards the edge of the colony. Each single branch is ringed at its base (or insertion) and bears a polyp at its tip. The polyps are white, rose or chestnut in colour with numerous, alternate, colourless tentacles and a ring of large nematocysts at the base of the polyp body. The mouth is borne on a short, globose projection, the hypostome. Reproductive polyps are borne on short stems at right angles to the branches, and distributed in clusters around the colony.Also known as Eudendrium arbuscula (see Hincks, 1868; Allman, 1871-1872; Marques & Vervoort, 1999).


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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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