An ocellus (plural: ocelli) is a type of photoreceptor organ in animals. Also called "simple eyes", ocelli are miniature eyes capable of sensing light but not distinguishing its direction. See also stemmata, which are structurally similar. Ocelli are found in many invertebrates. Insects in particular have two types of ocelli, dorsal ocelli and lateral ocelli. Dorsal Ocelli Dorsal ocelli are a visual pathway that co-exist with the compound eyes in many insects (for example Hymenoptera (bees, ant… (More on Ocellus)