Although typically uniformly slate-grey, it is not uncommon for the base of the antennae to be pale orange and numerous brightly mottled varieties are frequent. However, this pattern is random, and not arranged longitudinally, as seen in P. spinicornis or Trachelipus rathkii.
Distribution and Habitat
This species (along with Oniscus asellus) represents the archetypal ‘woodlouse’ familiar to the general public and is abundant under stones and dead wood throughout Britain and Ireland.
There are few habitats where it does not occur, but it is more tolerant of dries sites than O. asellus. P.scaber is the woodlouse most commonly encountered inside houses and readily climbs walls and trees.
This summary is based on the detailed account in Gregory (2009).