Ommatidium (plural: ommatidia) these are units that make up the compound eyes of insects, millipedes and mantis shrimp. A collection of photoreceptor cell bordered by pigment cells and other support cells make up the ommatidium.


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Many insects , especially Arthropods, consist of compound eyes...their eyes consist of many small pixel like units called ommatidia.
Ommatidium are each of the optical units that make up the compound eye of an insect