Scientific Name: Armadillidium vulgare
Family: Armadillidiidae
Native Range: Europe. Introduced to North America, Pennsylvania*
Size: Length: 18 mm (0.71 in)*
Active: Spring
Color and Appearance: Dark gray with yellow specks. Rolls itself into a complete sphere with no gap when frightened.*
*From BugGuide.net (https://bugguide.net/node/view/94180)