Oniscus asellus

Oniscus asellus, the common woodlouse, is one of the largest and most common species of woodlouse native to the British Isles and Western and Northern Europe, growing to 16 millimetres (0.63 in) long and 6 millimetres (0.24 in) wide. Oniscus asellus was first described by Swedish biologist Carl Linnaeus in his Systema Naturae, and is a very common species, representing in Britain "the archetypal 'woodlouse' familiar to the general public". It lives in a great variety of habitats, but favours damp conditions, especially under rotting wood. O. asellus is also a successfully synanthropic species, dwelling in gardens, walls, and inside houses.