STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Water spider. Coloured scanning electron micrograph (SEM) of the head of a water spider (Argyroneta aquatica), showing its large jaws (mandibles, centre right) and its eyes (upper right). A. aquatica is the only spider that lives permanently below water. It rests and eats in a bell-shaped retreat made of silk, which is filled with air carried from the surface. Magnification: x45 when printed 10cm wide.
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