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An eyespot, often called a stigma (derived from Greek for spot), is a heavily-pigmented organelle located near the cell membrane that seems to function in light reception in â¦ certain single-celled organisms.
Considering that photosynthesis and eyespot functions are based on many of the same chemical principles, it's not surprising to find these two things together in many single-celled organisms. Whether eyespots are related to the development of higher-level eyes is currently an open question.