Any of various small aquatic animals of the phylum Bryozoa that reproduce by budding and form mosslike or branching colonies permanently attached to stones or seaweed.

• 苔藓虫，苔藓虫门的小型水生动物，通过芽生繁殖，形成象苔藓一样的分支群体，一直附着在石头或海草上。