Description
Oniscus asellus is one of the largest native woodlice in Britain, at up to 16 mm (0.63 in) long. It is relatively flat, and is a shiny grey in colour, although juveniles are rougher.
Pale patches are often visible on the back of Oniscus asellus; these are areas that store calcium, which is then used to reinforce the exoskeleton after a moult. Moulting occurs in two halves, with the rear half moulting before the front half. The exuvia is often consumed by the animal after moulting.
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