Bryozoans.
Bryozoans are a very interesting group of animals, they have a unique organ - lophophore. Besides bryozoans the lophophore have only brachiopods and phoronids. The lophophore is a banch of tentacles covered with ciliaric epitelium.
All the bryozoans are very small colonial animals with lime skeleton.
There are very many species of these creatures in the White sea. Unfourtunately I made a photo of the one species: Cribrilina annulata.
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