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DescriptionThe main stems and side branches of this hydroid are erect and composed of several fibres. The hydrothecae are are arranged on long slender stalks, there are 5-6 rings at the top and the bottom of the stalk. The hydrothecae are bell-shaped with several even blunt cusps on the rim. The gonothecae are flask-shaped and are arranged on short ringed stalks. The whorled arrangement of the hydrothecae on unbranched stems is very characteristic of this species.