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DescriptionNemertesia antennina is a colonial hydroid. The colony consists of up to 50 thick, stiff, erect, stems which can be up to 25 cm tall. The stems grow from a fibrous mass of rootlets. The stems bear bundles of 6-10 whorled side branches, these are incurved and widest at their bases. Nemertesia antennina is orange-buff in colour.