👉 Photostomia is a type of gastropod mollusk that belongs to the family Chelidae, specifically the photostomid group. These photostomians are known for their ability to produce and store photosynthesis through specialized structures called photoreceptors. They have a unique digestive system made up of two main parts: the mouth (which contains a large mouth) and the digestive tract (a series of organs that includes the anus, which is typically covered in skin).