This medium sized species (to 11mm) with a stepped body outline bearing a distinctive dark dorsal strip, runs rapidly when disturbed. The antennae have three flagella segments and it lacks pleopodal lungs.
Confusion is most likely with Ligidium hypnorum (flagella of numerous bead-like segments) or Porcellionides cingendus (flagella of two segments, plus two pairs of pleopodal lungs). Orange colour forms have been mistaken for Androniscus dentiger.
Distribution and Habitat
P. muscorum is an abundant species in lowland England and Wales, but becomes increasingly sparse in northern England and becomes restricted to coastal sites and low-lying river valleys in Scotland.
It has a strong preference for grassy sites of all sorts, and tends to avoid dense woodland. Although often numerous within grassland swards, it is most easily found beneath refuge sites, such as dead wood, stones or even dried cowpats.