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The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Simple eye in invertebrates
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A simple eye or ocellus is a form of eye or an optical arrangement which has a single lens without the sort of elaborate retina that occurs in most vertebrates. These eyes are called "simple" to disti
Head of Polistes with two compound eyes and three ocelli (circled)
Head of Polistes with two compound eyes and three ocelli (circled)
This jumping spider's main ocelli (center pair) are very acute. The outer pair are "secondary eyes" and other pairs of secondary eyes are on the sides
This jumping spider's main ocelli (center pair) are very acute. The outer pair are "secondary eyes" and other pairs of secondary eyes are on the sides and top of its head.
Head of a wasp with three dorsal ocelli (centre), and the upper part of its compound eyes (left and right)
Head of a wasp with three dorsal ocelli (centre), and the upper part of its compound eyes (left and right)
Moth larva about to moult; the new stemmata are visible behind the old head capsule
Moth larva about to moult; the new stemmata are visible behind the old head capsule
Arthropod eye
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Apposition eyes are the most common form of eye, and are presumably the ancestral form of compound eye. They are found in all arthropod groups, although they may have evolved more than once within thi
Simple eye in invertebrates
…widely in the habitats in which they live, as well as their visual requirements for finding food or conspecifics, and avoiding predators. Consequently, an enormous variety of eye types are found in arthropods to overcome visual problems or limitations. Use of the term simple eye is flexible, and must be interpreted in proper context; for example, the eyes…
Insects and all mandibulates have compound eyes, with the exception of some myriapods that have stemmata.
Insects and all mandibulates have compound eyes, with the exception of some myriapods that have stemmata.
The male Tabanus lineola has holoptic compound eyes, with the dorsal ommatidia larger than the ventral ommatidia.
The male Tabanus lineola has holoptic compound eyes, with the dorsal ommatidia larger than the ventral ommatidia.
In some male mayflies the eyes are split into separate organs for distinct visual functions.
In some male mayflies the eyes are split into separate organs for distinct visual functions.
Stalked dichoptic eyes of a River Crab are typical of mature larger Crustacea. The reflection of the photographer in different regions of the surface
Stalked dichoptic eyes of a River Crab are typical of mature larger Crustacea. The reflection of the photographer in different regions of the surface of each eye indicate the basis for stereoscopic vision.