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Suborder Oniscidea - Woodlice

Woodlouse - Porcellio scaber Armadillidium vulgare? - Armadillidium vulgare Common Woodlouse (Oniscus asellus) - Philoscia muscorum Porcellio species? - Porcellio scaber Whitish sowbug Isopod Porcellio ? Crustacean
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)
Numbers
ca. 100 spp. in 37 genera of 15 families in our area, incl. 27 adventive spp. in 20 genera of 12 families(1)
Identification
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:
Range
worldwide
Habitat
wherever cool, dark, moist places are available to shelter woodlice from dryness and heat during the day
Food
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.