or
wood louse
Sow bug (Oniscus asellus).
Any of certain terrestrial
crustaceans of the order Isopoda, especially members of the genus
Oniscus. Native to Europe, they have been introduced into North America. Sow bugs grow to 0.7 in. (18 mm) long. The oval, gray body is rather arched and is covered with broad, armourlike plates. Two elbowed antennae extend about half the length of the body, and there are seven pairs of limbs. The sow bug lives in moist places, especially under stones, in moist leaf litter, and in cellars.
Seealso pill bug.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.