- 37 species in North America
• Sinistral - shell opening is on left when facing toward you with pointed end up
• Lack an operculum (hardened cover that seals the opening)
• Physid snails can breathe air
• Mostly found in areas with soft silt bottom
• Often found on submerged vegetation vegetation or on solid objects protruding from the bottom.
|Very Sensitive||Somewhat Sensitive||Facultative||Somewhat Tolerant||Very Tolerant|
Primary Information Source:
Voshell, J. Reese. 2002. A Guide to Common Freshwater Invertebrates of North America. McDonald and Woodward Publishing Company. Blacksburg, Virginia.