Are pillbugs all the same species?

Not at all. “Pillbug” (or “roly-poly”) can refer either to the Oniscomorpha, or (more properly) to the Armadillidiidae. The Armadillidiidae are an entire family of crustaceans that include fifteen genera and several hundred species. read more

Some species are able to roll into a ball when disturbed, hence the name, pillbugs. The broad head has 4 pairs of mouthparts and is followed by the 7 main trunk segments, which bear the walking limbs. read more

Armadillidium vulgare, the (common) pill-bug, potato bug, (common) pill woodlouse, roly-poly, doodle bug, or carpenter, is a widespread European species of woodlouse.It is the most extensively investigated terrestrial isopod species. read more