Trichoniscoides saeroeensis Lohmander, 1924

Common name

Coastal Red-eye


GB IUCN status: Least Concern

ID Difficulty



Trichoniscoides is a difficult genus and only male specimens of T. saeroeensis (a predominantly coastal species) can be distinguished from T. helveticus or T. sarsi (the latter has also been rccorded from coastal habitats). Identification should be based on microscopic examination of male 2nd endopod.

All three are small (to 4 mm) creamy-white woodlice flushed with varying amounts of orange.  The dorsal surface is covered with weak tubercles and the eye is composed of a single pinkish-orange ommatidum. All eye and body pigments are rapidly lost in alcohol, thus making preserved specimens difficult to separate from Metatrichoniscoides celticus or M. leydigii.

Keith Lugg
Keith Lugg
Andrew Lewington
Andy Marquis
Warren Maguire
Warren Maguire

Distribution and Habitat

Although widely distributed around the entire coastline of Britain and Ireland, it is not confined to coastal habitats. It has been recorded up to 12km inland deep inside limestone caves and mines, and on the summits of limestone mountains.
None-the-less, it is typically found in the supralittoral zone associated with coastal erosion banks, sparsely vegetated shingle or salt marsh strandline. Here it tends to occur several centimetres below the surface, where damp peaty soil occurs and most easily collected by turning large partly embedded stones. It is often found with Haplophthalmus mengii.

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