Usage examples (4)

• Since insects have compound eyes (with straight tubes or light guides radiating out from the centre of the eye like the spines of a hedgehog), this might amount in practice to...
• In the honeybee each ommatidium contains six green photoreceptors, which give rise to the short visual fibres.
• Each of the crab's ommatidium is like one of your camera's pixels - but instead of millions there is just 8,000.
• In Bombus impatiens a similar pattern is likely, since UV opsin is found in zero, one or two receptors per ommatidium, and these cells always correspond to the R1 or R5...