Glomeris marginata, f. lucida and juv. on hand
The large dark one is a young adult in the usual colours (will get a bit darker still with age). The brown one is also a young adult (size) but of a colour variety known as "lucida" - it will basically stay this way (pale brown). The small one is a juvenile, showing that the little ones carry many pale spots and are thus harder to separate from other spotted species.
Here is the same trio on a more natural background:
''Glomeris marginata'' is a common European species of pill millipede. It is a short millipede, rounded in cross-section, which is capable of rolling itself up into a ball when disturbed. This behaviour is also found in the pill woodlouse ''Armadillidium'', with which ''G. marginata'' is often confused.
Similar species: Northern Pill Millipedes
