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Family: Valloniidae
Common name: Trumpet Vallonia
Discovery: Sterki, 1893
Identification
Width: 2 mm
Height: 0.9 mm
Whorls: 3+
The shell of this species has a wide umbilicus and a low apex. The shell is thin, but the circular aperture has a thick, reflected peristome. The shell is mostly colorless, with thin radial ridges. It is similar to V. costata, but smaller, flatter, and with a wider umbilicus.
Ecology
Vallonia parvula is found in grasses and in leaf litter (Hubricht, 1985). Some authors suggest Vallonia species are mostly introduced in eastern North America (e.g. Nekola, 2008).
Taxonomy
Synonyms for V. parvula are: V. americana and V. costata var. minor.
Distribution
This species is widely but sparsely reported in eighteen states, from Texas and Florida north through the central states to Ontario and northeast to New York (Hubricht, 1985). In Virginia, it has been found only in Highland county.
Conservation
NatureServe Global Rank: G4
NatureServe State Rank: S1
Virginia’s wildlife action plan: Tier IV
