THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands |
Identify taxa |
| Viviparidae (introduced) shell is generally broad or globose, aperture may be very large; only family in NW with operculum made of concentric circles instead of spirals; may look similar to some Lymnaeidae, but with operculum |
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Snails uncommon in wetlands
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