Pachymerium ferrugineum (C.L.Koch, 1835)

Distribution

The 'short form' of Pachymerium ferrugineum is known from a handful of sites on the coasts of southern England (Dorset to Norfolk). In 2019 the 'long form' was discovered on the Channel Islands.  

[The inland records shown on the NBN map (opposite) need verification.]

Habitat

Both forms are invariably recorded from shingle beaches above the storm drift line, either within  shingle or beneath drift wood, often on the landward side on shingle banks. 

Interestingly in France the long form is found exclusively on beaches along the Mediterranean and Atlantic coastline, while the 'short form', although still coastal, can also be found along river banks, in woodland, salt marsh, etc.  

This account is based on the 'Centipede Atlas' (Barber, 2022) and Barber, Gregory & Marquis (2020).