Trichoniscoides albidus (Budde-Lund, 1880)

Common name

Rough Pygmy Woodlouse


GB IUCN status: Least Concern

ID Difficulty



In size, shape and colour this small woodlouse is similar in appearance to the ubiquitous Trichoniscus pusillus.  It differs in having a coarsely tuberculate body surface, eye comprising a single ommatidium, and all eye and body pigments are rapidly lost in alcohol.

J.P. Richards
J.P. Richards
Keith Lugg
Jane Thomas

Distribution and Habitat

In southern and eastern England it is widespread, but probably under-recorded, and appears to be rare in Ireland.

It inhabits damp friable soils in a wide range of habitats, including wet deciduous woodland, alluvial meadows, banks of streams and ditches, seepages on ‘soft’ slumping cliffs, and occasionally churchyards and farmyards.

It is elusive and characteristically found with difficulty on the underside of embedded stones and dead wood or amongst damp rubble.  It is typically found with Trichoniscus pusillus agg., T. pygmaeus and Haplophthalmus spp. 

This summary is based on the detailed account in Gregory (2009).



Gregory, S. (2009) Woodlice and Waterlice (Isopoda: Oniscidea & Asellota) in Britain and Ireland.  Field Studies Council/Centre for Ecology & Hydrology.



BRC Code