Distribution and Habitat
It occurs mainly south of The Wash and River Severn, being most abundant in south east England. (NBN records from the north-east need to be verified.)
In the south-east it inhabits a wide range of waterlogged habitats, but further north and west it becomes restricted to semi-natural habitats, such as ancient woodland and fen carr. It occurs among moss and leaf litter, within sedge and grass tussocks, or beneath dead wood and stones. A very fast woodlouse, and difficult to capture.
This summary is based on the detailed account in Gregory (2009).