Lithobius calcaratus C.L. Koch, 1844

Lithobius is a difficult genus and at least 17 species are known from Britain and Ireland.

This is one of seven 'smaller species' with 2 + 2 forcipular teeth that lack backward projections on tergites 9, 11 and 13. Lithobius calcaratus is typically very dark, almost black, as seen in L. muticus, but differs in having a normal shaped head and by having an 'accessory' claw on the last legs. The male is readily identified by the presence of a hairy 'wart-like process' on the last leg pair (see mages).  

More information to allow accurate identification is given in the published identification keys by Tony Barber (2008 & 2009).