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Family Armadillidiidae - Pillbugs

Pillbug - Armadillidium vulgare robust Pillbug - Armadillidium Wood Louse 1316 - Armadillidium Isopod - Armadillidium nasatum Armadillidium vulgare? - Armadillidium vulgare pill bug rolling up_Woodlouse - Armadillidium vulgare pill bug_Woodlouse - Armadillidium vulgare Pillbug - Armadillidium nasatum
Classification
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)
Identification
In Armadillidiidae the tails (uropods) are shorter than the last abdominal segment. (1)
Most other families can not roll into a ball and have tails longer than the last abdominal segment.
In the following image Porcellio scaber is in the family Porcellionidae and Armadillidium nasatum is in the family Armadillidiidae. Note the length of the tails in each.

Internet References
adult image of Armadillidium nasatum and photos of 2 other species not in Armadillidiidae (Scott Baird, Wright State U., Ohio)
classification and list of worldwide genera (ITIS)
Works Cited
1.Spiders and Their Kin: A Golden Guide from St. Martin's Press
Herbert W. Levi, Lorna R. Levi, Nicholas Strekalovsky. 2001. St. Martin's Press.