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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.
eyespot. n. 1. (Biology) a small area of light-sensitive pigment in some protozoans, algae, and other simple organisms. 2. (Biology) an eyelike marking, as on the wings of certain butterflies.yespot. n. 1. (Biology) a small area of light-sensitive pigment in some protozoans, algae, and other simple organisms. 2. (Biology) an eyelike marking, as on the wings of certain butterflies.