Ключевые слова: aquatic, background, benthic, biological, biology, body cavity, cells, detail, dugesia, ecuador, education, eye, eye spots, eyespots, flat, flatworm, flatworms, freshwater, germ layers, isolated, jungle, laboratory, layers, macro photography, microscope, microscopic, mucus, nerves, nervous, nervous system, ocelli, parasite, pharynx, planaria, planarian, planeria, platyhelminthes, predator, regeneration, scientific, scientist, separate, spot, system, turbellaria, turbellarian, white, worm, zoological, zoology,