Oregon Department of Agriculture guides
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Genus: Vespericola

Common name: Hesperian snails
Family: Polygyridae

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Vespericola columbianus, the Northwest hesperian
Origin: Pacific Northwest
Diet: Plants, lichens, and algae.
Behavior: Most common around wet areas, wetlands, rivers, etc.
Where in Oregon: Widespread.
Similar exotics to look for: There are a number of hairy shelled snails around the world that would be challenging to distinguish from Oregon natives. Cryptomastix germana is a similar native species. There are five species of Vespericola native to Oregon. Outside of southwestern Oregon V. columbianus, the Northwest hesperian, is the most common.
Dorsal view of garlic snail
Vespericola columbianus
Vespericola shells range from 11 to 20 millimeter
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