Caddisfly head. Coloured scanning electron micrograph (SEM) of the head of a caddisfly (order Trichoptera), showing the mouthparts (centre) and compound eyes (red). The mandibles (biting mouthparts) are at lower centre, below these are the labial palps. At centre right and left are the maxillary palps. The palps are sensory organs, covered in hairs. Caddisflies are moth-like insects but have hairy wings rather than the scaled wings of moths and butterflies.
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