Fly eye facets, SEM

Fly eye facets, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Fly eye facets. Coloured scanning electron micrograph (SEM) of facets on the eye of a fly. Each of the two compound eyes comprises several thousand image-forming facets called ommatidia. Each ommatidium is a simple eye, which sends a signal to the fly's brain. The brain combines the thousands of images to form a mosaic view of the world. The image is not sharp but is excellent at detecting movement. In between the ommatidia are hair-like structures called interommatidial bristles. These bristles are frequently modified, duplicated or absent in mutant Drosophila fruit flies.

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Keywords: animal, bristle, coloured sem, compound, diptera, dipteran, eye, facet, facets, fly, hair, horizontal, insect, insecta, interommatidial bristles, invertebrate, invertebrates, nature, ommatidia, ommatidium, scanning electron micrograph, sight, vision, wildlife, zoology

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