1 Zoology A light-sensitive pigmented spot on the bodies of invertebrates such as flatworms, starfishes, and microscopic crustaceans, and also in some unicellular organisms.
- However, when the pigmented eyespot is absent, the light penetrates the body and the front-to - back contrast is reduced.
- They do not have image-forming eyes, but many species have pigment cells and photoreceptors concentrated into eyespots.
- However, pigmented eyespots are visible in wild-type larvae and late-stage embryos.
2A rounded eye-like marking on an animal, especially on the wing of a butterfly or moth.
- The bodies are light and ill-defended, except for the armored face, which is designed to draw attacks to it, like the eyespots on butterfly wings.
- The beautiful eyespots on butterfly wings are thought to rely on the principles described above, although involving more morphogens.
- The colorful eyespots on butterfly wings may be patterned by a mechanism similar to that used to organize the proximo-distal axis of the insect leg.
3 [mass noun] A fungal disease of cereals and other cultivated grasses, characterized by yellowish oval spots on the leaves and stems.
- The percentage of stems affected by damaging lesions of eyespot at 22.1pc was the highest on record.
- The pathogen survives on corn debris, so reduced tillage and continuous corn create a high-risk environment for development of eyespot, especially if there is heavy residue and a history of it in that location.
- Where eyespot is over threshold the preferred fungicide would be cyprodinil although Punch and Landmark both have some activity against eyespot and can give useful control.
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