ocellus
From ZooTerms (Dictionary of Invertebrate Zoology)
ocellus (noun; plural ocelli; Latin diminutive oculus, eye): 1. The simple eyes or eyespots, occurring singly or in small groups, found in many invertebrates.
2. (Arthropoda: Crustacea) see nauplius eye.
3. (Arthropoda: Insecta) see stemma, ommata.
4. (Mollusca: Polyplacophora) see aesthete.
