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Mayfly (Oligoneuriella rhenana) nymph head. Coloured scanning electron micrograph (SEM) of the head of a mayfly larva (nymph), showing the hairy mouthparts (upper centre) that it uses to filter food from the water. Mayfly larvae are aquatic animals that breath underwater using gills. Magnification: x16, when printed 10 cm wide.
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