Characteristics: subglobose to depressed shell, simple lip, umbilicate, usually glossy shell, with irregular growth lines and often with light irregular lines in addition.
Habitat: a generalist - woodlands, some grasslands, leaf litter, and woody debris (look in the crevices)
Status: probably stable
Key to Zonitoides based on Oesch et al. (2013) and from an unsecured archived page.
1a. Shell surface glossy, with weakly sculptured growth wrinkles; 5-8 mm diameter; aperture oval - 2
1b. Shell surface dull, with closely spaced, prominent axial ridges; diameter 4.3-5.0 mm diameter; aperture nearly round - Zonitoides limatulus
2a. Smaller (4.5-6.0 mm diameter) with a smaller aperture - Zonitoides arboreus
2b. Larger (6-8 mm diameter) with larger aperture - Zonitoides nitidus