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Genus Armadillidium

unknown - Armadillidium nasatum Armadillidium - Armadillidium vulgare Armadillidium vulgare Armadillidium vulgare armadilldium vulgar - Armadillidium vulgare pill millipide or pill bug? - Armadillidium vulgare Armadillo Woodlice - Dorsal - Armadillidium nasatum Pill Bug ID? - Armadillidium
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Marsupial Crustaceans)
Order Isopoda (Isopods)
No Taxon (Scutocoxifera)
Suborder Oniscidea (Woodlice)
Infraorder Holoverticata
No Taxon (Orthogonopoda)
No Taxon (Crinocheta)
Family Armadillidiidae (European Pillbugs)
Genus Armadillidium
2 species in North America, both introduced
over 300 species in Europe, most concentrated around the Mediterranean

In A. nasatum (left), the telson has a rounded tip. In A. vulgare (right), the telson is truncate, more trapezoidal.

A. vulgare, on the left, rolls into a perfect ball, while the tail of A. nasatum, on the right, sticks out when it rolls into an imperfect ball.

In A. vulgare (left), the scutellum barely projects. In A. nasatum (right), the scutellum projects.

For comparison:
A. nasatum; A. vulgare:


Variation in A. nasatum:

Variation in A. vulgare:
Worldwide, originally from Europe.
Internet References