DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Fly mouthparts. Light micrograph of the mouthparts of a house fly (Musca domestica), seen from below. The proboscis extends outwards, ending in two spongy pads called the labella (lower frame). These have pseudo-tracheae (ridges) that channel saliva to dissolve the fly's food. The resulting liquid food is sucked back up through the labella. Magnification: x13 when printed at 10 centimetres wide.
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