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Genus Armadillidium

Armadillidium - Armadillidium vulgare Armadillidium vulgare Armadillidium nasatum armadilldium vulgar - Armadillidium vulgare Armadillidium - Armadillidium nasatum Common Pill Bug (Roly Poly) - Dorsal - Armadillidium vulgare Small Woodlouse - Armadillidium nasatum Armadillidium - Armadillidium vulgare
Classification
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
Numbers
2 species in North America, both introduced
over 300 species in Europe, most concentrated around the Mediterranean
Identification

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:


(1)(2)

Variation in A. nasatum:


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