Philoscia affinis Verhoeff, 1908


Although superficially similar to the ubquitous P. muscorum in general appearence, the pigmentation of the head and body is a good guide to identification, but reliable identification requires microscopic examination of 7th pereiopod of a male specimen.

A description, with figures, is given by Segers, Boeraeve & De Smedt (2018).


Keith Lugg
Keith Lugg
Steve Gregory
J. P. Richards
J. P. Richards

Distribution and Habitat

The presence of this species in the UK was first confirmed in south-east England in summer 2017 (Segers, Boeraeve & De Smedt, 2018).
Subsequently, specimens collected in 2007 from Oban, western Scotland (but, mis-identified as P. muscorum) have been discovered and in winter 2017 a male specimen was collected from a site in south Devon and a possible females from north Wales and Derbysire. This species has clearly been over-looked in Britain and could prove to be widespread if searched for.
This species has a preference for woodland sites (possibly wet and/or acidic) whereas P. muscorum favours grassland sites.


Segers, S., Boeraeve, P. & De Smedt, P. (2018) Philoscia affinis Verhoeff, 1908 new to the UK (Isopoda: Philosciidae).  Bulletin of the British Myriapod & Isopod Group 30: 21-25.