Neodermata is a subphylum of flatworms. There are 18921 species of Neodermata, in 3025 genera and 298 families. It includes groups like Cestodes and Flukes. They rely on ciliary gliding to move around.
Definition: Eye-spots which may be set into a pit to reduce the angles of light that enters, to allow the organism to deduce the angle of incoming light. Lens-like structures may be present, but stemmata, unlike lens eyes, cannot form an image, either for lack of refractive power or retinal resolution.