Characteristics: depressed to discoidal; aperture rounded and lip reflected; umbilicate; whorls with irregularly spaced high ribs or ridges; ~1.5-3 mm in diameter.
Habitat: Can be found in both upland and floodplain woodlands, in and around woody debris or rocks, or in soil; may be found in glades and prairies.
Status: Three main species are potentially widely scattered, three others less common.
Key to Vallonia based on Oesch et al. 2013, Dourson 2015, and Hotopp et al. 2013.
1a. Shell with faint growth lines, but not clearly ribbed - 2
1b. Shell ribbed – 3
2a. Outer lip reflected - Vallonia pulchella
2b. Outer lip not reflected - Vallonia excentrica
3a. Aperture lip thickened within - 4
3b. Aperture lip thin - Vallonia perspectiva
4a. Shell diameter about 1.6-2.0 mm; major ridges 30-38 on the last whorl - Vallonia parvula
4b. Shell diameter about greater than 2 mm – go to 5
5a. With 45-55 ribs or ridges on the last whorl - Vallonia gracilicosta
5a. With 20-35 paper-thin ribs or ridges in last whorl - Vallonia costata