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)
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)
Moth larva about to moult; the new stemmata are visible behind the old head capsule
Arthropod
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Arthropods are invertebrates in the phylum Arthropoda. They possess an exoskeleton with a cuticle made of chitin, often mineralised with calcium carbonate, a body with differentiated segments, and pai
Simple eye in invertebrates
…or basic. The structure of an animal's eye is determined by the environment in which it lives, and the behavioural tasks it must fulfill to survive. Arthropods differ widely in the habitats in which they live, as well as their visual requirements for finding food or conspecifics, and avoiding predators…
Protaetia cuprea (copper chafer). Beetles are the most diverse order of arthropods.
A cicada climbing out of its exuvia while attached to tree
Long bristles (setae) of a Tliltocatl albopilosus tarantula