Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes



ommatidium, ommatidia

Ommatidium of Machilis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (O)
No Taxon ommatidium, ommatidia
Explanation of Names
From Greek ommation little eye, that from ommato to furnish with eyes, plus diminutive suffix -idion (1).
ommatidium noun, plural ommatidia - individual element(s) of an insect's compound eye (oculus). Each ommatidium consists of a lens, cone, rhabdom (photoreceptive structure), and pigment cells. The number is variable--from one in worker ants, to circa 2,000 in a dragonfly, and up to 9,000 in some insects. Each ommatidium is approximately 20 μm in diameter and 100 μm in length (1).
Print References
Gordh, entry for ommatidium (1)
Internet References
Works Cited
1.A Dictionary of Entomology
George Gordh, David H. Headrick. 2003. CABI Publishing.