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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.
(It may also refer to a region of light-sensitive cells in the epidermis of certain invertebrates like worms and starfish that performs the same function.) An example of single-celled organisms that have an eyespot are euglenids.