PETR JAN JURACKA / SCIENCE PHOTO LIBRARY PETR JAN JURACKA / SCIENCE PHOTO LIBRARY
Pill woodlouse (Armadillidium sp.), scanning electron micrograph (SEM). Pill woodlice, or pill bugs, are terrestrial isopod crustaceans that are able to roll themselves up into a ball (as here) for defence when threatened. This specimen measures 4.7mm across.
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