Mayfly larvae, light micrograph
Light micrograph of the gills on the abdomen of an aquatic insect larvae of species Cloeon dipterum. The larvae and nymphs of mayflies possess tracheae (air pipes) that are connected to gills, which are very thin extensions of the exoskeleton through which oxygen in the water can diffuse. Magnification: x30 when printed at 10 centimetres wide at its longest edge., by HAKAN KVARNSTROM / SCIENCE PHOTO LIBRARY
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