References

Anderson, Tamara Ph.D. 2004. Mystery Vertigo (Vertigo paradoxa): A Technical Conservation Assessment. USDA Forest Service, Rocky Mountain Region, Species Conservation Project. <URL:http://www.fs.fed.us/r2/projects/scp/assessments/mysteryvertigo.pdf> Accessed 1 November 2011.

Encyclopedia Britannica 2011. <URL: http://www.britannica.com/EBchecked/topic/329230/land-snail> Accessed 30 October 2011.

U.S. Fish and Wildlife Service: Endangered Species Program. 2003. <URL: http://www.fws.gov/endangered/> Accessed 3 November 2011.

Encyclopedia of Life. 2011. <URL:http://eol.org/pages/403831/overview> Accessed 1 November 2011.

Martin, S.M. 2000. Terrestrial Snails and Slugs (Mollusca: Gastropoda) of Maine. Northeastern Naturalist. 7(1): 33-88.

Nature Serve. 2003. NatureServe Explore: An online encyclopedia of life.<URL: http://www.natureserve.org/explorer> Accessed 1 November 2011.

Sterki. 2007. Vertigo paradoxa: Mystery Vertigo. Michigan Natural Features Inventory. <URL:http://web4.msue.msu.edu/mnfi/abstracts/zoology/Vertigo_paradoxa.pdf> Accessed 28 October 2011.

Nekola, J.C. 2003. Terrestrial gastropod fauna of Northeastern Wisconsin and the Southern Upper Peninsula of Michigan. American Malacological Bulletin. 18(1-2): 24pp.

Pearce, T.A., C. Richart, W.P. Leonard, P.A. Hohenlohe. 2004. Identification Guide to Land Snails and Slugs of Western Washington. <URL:http://academic.evergreen.edu/projects/ants/tescbiota/mollusc/key/webkey.htm> Accessed 1 November 2011.

Pilsbry, H. A. 1939-1948. Land Mollusca of North America (north of Mexico). Monographs of the Academy of natural Sciences of Philadelphia, 3(2): 943.

For more information on Wisconsin Snails, you can visit these links:
MultipleOrganisms.net
Wisconsin Land Snails

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