turbellarians
Turbellarians, historically referred to as Turbellaria, are a broad, informal grouping of flatworms within the phylum Platyhelminthes. They are predominantly free-living and inhabit aquatic environments or damp terrestrial habitats, ranging from freshwater planarians to many marine species. They are generally small to medium-sized and lack a true body cavity (acoelomate).
Anatomy and physiology: Turbellarians are dorsoventrally flattened with a ciliated epidermis and a muscular body wall.
Ecology and feeding: They prey on small invertebrates, protozoans, or decaying matter, using a muscular pharynx
Taxonomy and significance: Turbellaria is a traditional, paraphyletic grouping. In contemporary classifications, most free-living forms lie