Occurrences

County Name	Number of Occurrences	Year Last Observed
Charlevoix	2	1940
Crawford	1	1957
Leelanau	1	1949
Roscommon	2	1957

Updated 05/08/2013. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Natural Community Types

• Inland lake, littoral, benthic
• Inland lake, littoral, midwater
• Submergent marsh

Management

Almost nothing is known about this species, but it is probable that it is sensitive to water pollution as well as pesticides and herbicides, especially those used to control invasive weeds such as eurasian water milfoil in large lakes. Alternatively, controlling invasive aquatic weeds may be beneficial by allowing native vegetation that might be associated with the snail to flourish. Snail-killing chemical molluscicides (copper sulfate or copper carbonate) that are used to treat lakes with swimmer's itch should be strictly avoided in lakes and streams occupied by rare snails. The introduction of fish species for recreational or commercial fishing is also strongly discouraged since many fish prey on aquatic snails and could greatly reduce populations or cause local, state, or global extirpation.

Active Period

Active from third week of May to second week of September

Survey Methods

This species can be surveyed using several techniques. One survey method consists of sweeping aquatic vegetation or scraping the substrate with a fine mesh aquatic sampling net or dip net (e.g., D-frame net). Another survey technique consists of vigorously shaking aquatic vegetation over a pail of water causing the various snails clinging to the plants to drop to the bottom of the pail. Visual surveys also can be conducted for this species by looking for snails attached to vegetation, rocks, woody debris and other cover. Glass bottomed buckets may be used to see snails clinging to vegetation or rocks underwater. Rocks, vegetation, and other cover also should be picked up, examined for snails, and returned to their original positions.

• Sweeping with dip net
  • Survey Period: From third week of May to second week of September
    • Time: Daytime
• Shaking vegetation survey
  • Survey Period: From third week of May to second week of September
    • Time: Daytime
• Visual survey
  • Survey Period: From third week of May to second week of September
    • Time: Daytime

Page Citation

References

Survey References

• Berry, E.G. 1943. The Amnicolidae of Michigan: Distribution, Ecology, and Taxonomy. University of Michigan Press, Ann Arbor. 68pp.

• Clarke, A.H. 1981. The Freshwater Molluscs of Canada. National Museum of Natural Science, National Museums of Canada, Ottawa. 446pp.

Technical References

• Burch, J.B. 1988. North American Freshwater Snails. Walkerana 2(6)

• Dillon, R.T. Jr. 2000. The Ecology of Freshwater Molluscs. Cambridge University Press, Cambridge, UK. 509pp.

• Environmental Protection Agency. 1982. Freshwater Snails (Mollusca: Gastropoda) of North America. EPA Publication 600/3-82-026. Environmental Monitoring and Support Laboratory, Office of Research and Development, U.S. EPA, Cincinnati. 294pp.

• Evers, D.C. 1994. Endangered and Threatened Wildlife of Michigan. The University of Michigan Press, Ann Arbor. 412pp.

• Goodrich, C. 1932. The Mollusca of Michigan. The University of Michigan Press, Ann Arbor. 121pp.

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