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The tall sea pen is colonial (1), often occurring in dense 'forests' (3). This species is a passive suspension feeder, taking in plankton and organic particles from the water column with the tentacles (3). The sexes are separate, with male and female polyps occurring in separate colonies on different sea pens (1). The tall sea pen can play host to a brittlestar (Asteronyx loveni), which encircles it with its arms in order to cling on, and an isopod (Astacilla lonicornis) (1).


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Source: ARKive


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