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For Insects, Spiders & Their Kin
For the United States & Canada
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Suborder Oniscidea - Woodlice

Pill Bug - Armadillidium vulgare woodlice - Oniscus asellus Which Armadillidium? - Armadillidium vulgare Isopod - Armadillidium nasatum woodlouse  - Porcellio scaber unknown bug - Philoscia muscorum woodlouse - Porcellio scaber Albino Oniscus - Oniscus asellus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Peracarida (Amphipods and Isopods))
Order Isopoda (Isopods)
Suborder Oniscidea (Woodlice)
ca. 100 spp. in 37 genera of 15 families in our area, incl. 27 adventive spp. in 20 genera of 12 families(1)
In Armadillidiidae, the uropods are shorter than the last abdominal segment(2); members of most other families cannot roll into a ball and have uropods longer than the last abdominal segment. Compare Porcellio scaber (Porcellionidae) and Armadillidium nasatum (Armadillidiidae) here:
wherever cool, dark, moist places are available to shelter woodlice from dryness and heat during the day
Plant material, usually dead. If live plants are soft and moist enough on the outside, they will eat them and sometimes do damage.
Works Cited
1.Checklist of the terrestrial isopods of the New World (Crustacea, Isopoda, Oniscidea)
Leistikow A., Wägele J.W. 1999. Rev. Bras. Zool. 16(1): 1-72.
2.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.