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Genus Armadillidium

Armadillidium vulgare ? - Armadillidium vulgare Armadillidium nasatum or just another vulgare? - Armadillidium nasatum 200305 Woodlouse - Armadillidium vulgare pill bug rolling up_Woodlouse - Armadillidium vulgare Pillbug near USDA/Clemson lab - Armadillidium vulgare Armadillidium vulgare armadilldium vulgar - Armadillidium vulgare Woodlouse - Armadillidium nasatum
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Peracarida (Amphipods and Isopods))
Order Isopoda (Isopods)
Suborder Oniscidea (Woodlice)
Infraorder Holoverticata
No Taxon (Orthogonopoda)
No Taxon (Crinocheta)
Family Armadillidiidae (Pillbugs)
Genus Armadillidium

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