苔藓动物是一类个体微小的原始水生群体动物，是介于“原口动物”和“后口动物”之间的过渡类型的动物。之所以被称为“苔藓动物”或“苔藓虫”，只是由于它们的群体形态在外形上很像苔藓植物而已。大部分苔藓动物都生活在海洋里，只有极少数种类生活在淡水中。在显微镜下，其 Bryophytes are a group of tiny, primitive, aquatic group of animals that are transitional types of animals between “mouth-opening animals” and “back-mouth animals.” They are called “bryozoans” or “bryozoans,” simply because their group morphology is similar in appearance to bryophytes. Most of the mosses are living in the ocean, and only a few species live in freshwater. Under the microscope, it