Which Insects Have Ommatidia?

The number of ommatidia in the eye depends upon the type of arthropod and range from as low as 5 as in the Antarctic isopod Glyptonotus antarcticus, or a handful in the primitive Zygentoma, to around 30,000 in larger Anisoptera dragonflies and some Sphingidae moths.

How many ommatidia do insects have?

Insects' eyes generally contain between 3,000 and 9,000 ommatidia, or optical units, although darting insects like dragonflies can have as many as 25,000 in each eye. The more ommatidia, the better the image resolution, but unlike human eyes, insects tend to perceive shapes and outlines rather than crisp details.

Where are the ommatidia found?

Rhabdom, transparent, crystalline receptive structure found in the compound eyes of arthropods. The rhabdom lies beneath the cornea and occurs in the central part of each ommatidium (visual unit) of compound eyes.