eyespot

Any of various primitive light-sensitive organs or regions in many diverse organisms.

The eyespot is a complex sandwich of membranes with rows of granules that contain around 200 different proteins, including the same rhodopsins found in the retina of our own eye.

An eye-like marking on the tail of a peacock or the wing of a butterfly.

A coloured spot in a motile gamete or spore, which is sensitive to light.

Any of a group of fungal infections of grasses that are characterized by oval spots; strawbreaker.