Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Order Isopoda - Isopods

Pillbug - Armadillidium vulgare Brown Sowbug - Philoscia muscorum Potato eater - Porcellio scaber Armadillidium vulgare? - Armadillidium vulgare Crustacean - Ligia baudiniana Porcellio scaber maybe ? - Oniscus asellus Bug ID request - Porcellio spinicornis Immature?
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Peracarida (Peracarida (Amphipods and Isopods))
Order Isopoda (Isopods)
Other Common Names
cressbug, pillbug, sowbug, woodlouse, rock slater, roly-poly
Numbers
>10,200 spp. worldwide(1)
Size
2 to >300 mm (Bathynomus, a deep sea genus)
Identification
key to OH spp. in(2)
Range
Worldwide, from the deep sea to terrestrial habitats.
Remarks
Pillbugs and sowbugs, being crustaceans, breathe by means of gills. This is why they need moisture, but they will drown if submerged
Internet References
Coastal Isopods of California (Brusca et al. 2001)
Taxon profile (Brusca 1997)