Bryozoans or ectoprocta or polyzoa
The horny or chalky external cases of these small, colonial, mainly marine animals are branching and are often mistaken for small seaweeds. They possess a lophophore, a horseshoe-shaped fold of the body wall encircling the mouth. Ciliated tentacles round the mouth carry food particles through the gut. Bryzoans are hermaphrodites and reproduction is both asexual and sexual.
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