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Family: Discidae
Common name: Rotund Disk
Discovery: Müller, 1774
Non-native
Identification
Width: 5.5-7.0 mm
Height: 2.5-3.0 mm
Whorls: 5.5-6.0
The shell of this species is brown with reddish radial stripes or spots. The aperture is simple, the umbilicus open, and the transverse ribs somewhat coarse as is typical of many disk snails. The shell periphery is mildly keeled. The animal is blue-gray, darker above.
Ecology
Discus rotundatus lives in damp habitats – in woods, among herbaceous vegetation, under leaf litter and rocks, and in trash piles (Kerney and Cameron, 1979). In Poland, D. rotundatus reaches maturity in its second or third year and lives 2.5-3.5 years (Kuźnik-Kowalska, 1999). Up to 11 eggs are laid in a clutch, with peak egg-laying season in July and August (Kuźnik-Kowalska, 1999).
Taxonomy
Synonyms are Helix rotundata, Pyramidula rotundata (Pilsbry, 1948).
Distribution
Discus rotundatus is a central and western European native that has been spread to coastal and urban habitats in North America.
Conservation
NatureServe Global Rank: G5, Secure.
