Definition of Ommatidia. Meaning of Ommatidia. Synonyms of Ommatidia

Here you will find one or more explanations in English for the word Ommatidia. Also in the bottom left of the page several parts of wikipedia pages related to the word Ommatidia and, of course, Ommatidia synonyms and on the right images related to the word Ommatidia.

Definition of Ommatidia

Ommatidia
Ommatidium Om`ma*tid"i*um, n.; pl. Ommatidia. [NL., dim. of Gr. ?, ?, the eye.] (Zo["o]l.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

Meaning of Ommatidia from wikipedia

- like insects, crustaceans and millipedes are composed of units called ommatidia (singular: ommatidium). An ommatidium contains a cluster of photoreceptor...
- arthropods such as insects and crustaceans. It may consist of thousands of ommatidia, which are tiny independent photoreception units that consist of a cornea...
- photoreceptor units or ommatidia (ommatidium, singular). The image perceived is a combination of inputs from the numerous ommatidia (individual "eye units")...
- The individual ommatidia are directed in all directions and accordingly, one may see a dark spot (the pseudopupil), showing which ommatidia are covering...
- prey. Compound eyes consist of fifteen to several thousand independent ommatidia, columns that are usually hexagonal in cross section. Each ommatidium...
- con****uous in flight. An adult dragonfly's compound eyes have nearly 24,000 ommatidia each. Fossils of very large dragonfly ancestors in the Protodonata are...
- moves across the eye as the animal is rotated. This occurs because the ommatidia that one observes "head-on" (along their optical axes) absorb the incident...
- locate their prey by sight; their compound eyes contain up to 10,000 ommatidia. A small area at the front called the fovea has greater visual acuity...
- also been called Tetraconata, referring to having four cone cells in the ommatidia. That name is preferred by some scientists as a means of avoiding confusion...
- of ommatidia, clusters of photoreceptor cells. Each eye consists of two flattened hemispheres separated by parallel rows of specialised ommatidia, collectively...
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