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Whitefly compound eye. Coloured scanning electron micrograph (SEM) of the compound eye of a whitefly (Trialeuroides vaporarium). The eye is formed from numerous lens structures known as ommatidia (right). Whitefly is a serious plant pest, causing severe damage to ornamental and agricultural plants. (KEYSTONE/SCIENCE PHOTO LIBRARY/MARTIN OEGGERLI/SCIENCE PHOTO LIBRARY)