The Ommatidia reference article from the English Wikipedia on 24-Jul-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Ommatidia

Sponsorship the way you would do it
<em>[[Drosophila melanogasterEnlarge

[[Drosophila melanogaster

ommatidium]]

The compound eye of insects is composed of hundreds of unit eyes called ommatidia. An ommatidium contains a cluster of photoreceptor cells surrounded by support cell, and pigment cells. The outer part of the ommatidium is overlayed with a transparent cornea. The photograph to the right shows a cluster of photoreceptor cells from a single ommatidium from Drosophila melanogaster (magnified 400X). It is about 85 μm in length and 5-10 μm in diameter. The nucleus and the rhabdomere from a photoreceptor cell are visible.