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Family Armadillidiidae - Pillbugs

Sow Bug under bark - Armadillidium nasatum Pillbug - Armadillidium vulgare Which species of blue woodlouse is this? - Armadillidium vulgare Woodlouse - Armadillidium vulgare Isopod - Armadillidium nasatum A. vulgare Isopod - Armadillidium vulgare Armadillidium vulgare? - Armadillidium vulgare Pill bug - Armadillidium vulgare
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.

Remarks
Two introduced species
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.