Philoscia affinis Verhoeff, 1908

ID Difficulty



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
Christian Owen
Steve Gregory
J. P. Richards
J. P. Richards
Nicola Garnham
Nicola Garnham

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.