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Bryozoans

Bryozoa are a phylum of aquatic invertebrate animals, nearly all forming sedentary colonies. Typically, about 0.5 millimetres long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia. Individuals in bryozoan (ectoproct) colonies are called zooids, since they are not fully independent animals. All colonies contain autozooids, which are responsible for feeding and excretion.  - Wikipedia 

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