Planaria is a species of flatworm from the Turbellaria class and is the name for a member of the genus Planaria that is a part of the family Planariidae. It also often refers to the genus Dugesia. These free-living flatworms have three layers of tissues including an ectoderm, a mesoderm and an endoderm. These three layers of tissues are classified into both organs and organ systems, making flatworms the simplest animals that feature mesoderrmic layers and organ-system levels. It should be n