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Definition of ommatidium in English: ommatidiumnounPlural ommatidia ˌɒməˈtɪdɪəmˌäməˈtidēəm Entomology Each of the optical units that make up the compound eye of an insect. 〔昆〕小眼 Example sentencesExamples - Note that in the insect ommatidium (unlike vertebrate limbs and Drosophila appendages) cells are being specified and determined individually, not as groups of cells.
- In in flies we have seen examples of incorrect chiral type, incorrect rotation, symmetrical ommatidia, and ommatidia with an incorrect number of photoreceptor cells (data not shown).
- During their development, some crustaceans simply enlarge the larval eye, adding ommatidia as the animal grows.
- The normal compound eye has regular ommatidia and bristles.
- The adult retina consists of 800 identical unit eyes or ommatidia that are packed into a hexagonal array so precise that it is often referred to as a ‘neurocrystalline lattice’.
- The Drosophila retina is composed of 750 unit eyes, or ommatidia.
- The retina of the compound eye is organized into approximately 3000 functional units or ommatidia, each containing eight photoreceptor cells.
- The compound eye is composed of ~ 800 units called ommatidia.
- The adult retina is composed of 750 unit eyes known as ommatidia; each ommatidium contains precisely 14 cells.
- The compound eye of Drosophila is composed of hundreds of nearly identical ommatidia or unit eyes.
- Postlarvae settling at the vents have reasonably normal ommatidia, with layered rhabdoms, standard crystalline cones, and faceted external corneas reflective of the zoeal apposition eye.
- The ommatidium, or ‘unit eye,’ is reiterated nearly 800 times in the compound eye.
- In all these animals, the larval eye continues to exist as part of the adult eye, although the number of ommatidia in the adult compound eye far exceeds the larval quantity.
- Flies, crabs, and other arthropods have compound eyes in which many, sometimes hundreds, of individual ommatidia, or unit eyes, gather visual information.
- In contrast, myriapods and chelicerates mostly lack compound eyes and the ommatidia of the few groups that have compound eyes are very different from insect/crustacean ommatidia.
- At the end of each eyestalk are some 10,000 ommatidia, or little eyes.
- This paper dealt with the size of ommatidia as a function of body size in various insects.
- Normally, new ommatidia are added at the dorsal margin of the eye, and thus the retina gradually enlarges with growth of the eye at each successive molt.
- Fleas show a transformation of the multifaceted eyes and ommatidia of most insects, replaced instead with heavily sclerotized, atypical ocelli, or ‘eyespots,’ or in some cases, a complete absence of any eye at all.
- These novel morphological approaches to the study of the ommatidia and the foregut ossicles may have limited application in the fossil record.
OriginLate 19th century: modern Latin, from Greek ommatidion, diminutive of omma, ommat- 'eye'. Definition of ommatidium in US English: ommatidiumnounˌäməˈtidēəm Entomology Each of the optical units that make up a compound eye, as of an insect. 〔昆〕小眼 Example sentencesExamples - Postlarvae settling at the vents have reasonably normal ommatidia, with layered rhabdoms, standard crystalline cones, and faceted external corneas reflective of the zoeal apposition eye.
- The Drosophila retina is composed of 750 unit eyes, or ommatidia.
- The adult retina is composed of 750 unit eyes known as ommatidia; each ommatidium contains precisely 14 cells.
- In in flies we have seen examples of incorrect chiral type, incorrect rotation, symmetrical ommatidia, and ommatidia with an incorrect number of photoreceptor cells (data not shown).
- These novel morphological approaches to the study of the ommatidia and the foregut ossicles may have limited application in the fossil record.
- In all these animals, the larval eye continues to exist as part of the adult eye, although the number of ommatidia in the adult compound eye far exceeds the larval quantity.
- Note that in the insect ommatidium (unlike vertebrate limbs and Drosophila appendages) cells are being specified and determined individually, not as groups of cells.
- In contrast, myriapods and chelicerates mostly lack compound eyes and the ommatidia of the few groups that have compound eyes are very different from insect/crustacean ommatidia.
- Flies, crabs, and other arthropods have compound eyes in which many, sometimes hundreds, of individual ommatidia, or unit eyes, gather visual information.
- This paper dealt with the size of ommatidia as a function of body size in various insects.
- During their development, some crustaceans simply enlarge the larval eye, adding ommatidia as the animal grows.
- At the end of each eyestalk are some 10,000 ommatidia, or little eyes.
- Normally, new ommatidia are added at the dorsal margin of the eye, and thus the retina gradually enlarges with growth of the eye at each successive molt.
- The compound eye is composed of ~ 800 units called ommatidia.
- The ommatidium, or ‘unit eye,’ is reiterated nearly 800 times in the compound eye.
- The compound eye of Drosophila is composed of hundreds of nearly identical ommatidia or unit eyes.
- The adult retina consists of 800 identical unit eyes or ommatidia that are packed into a hexagonal array so precise that it is often referred to as a ‘neurocrystalline lattice’.
- The normal compound eye has regular ommatidia and bristles.
- Fleas show a transformation of the multifaceted eyes and ommatidia of most insects, replaced instead with heavily sclerotized, atypical ocelli, or ‘eyespots,’ or in some cases, a complete absence of any eye at all.
- The retina of the compound eye is organized into approximately 3000 functional units or ommatidia, each containing eight photoreceptor cells.
OriginLate 19th century: modern Latin, from Greek ommatidion, diminutive of omma, ommat- ‘eye’. |