Anderson, Tamara Ph.D. 2004. Mystery Vertigo (Vertigo paradoxa): A Technical Conservation Assessment. USDA Forest   Service, Rocky Mountain Region, Species Conservation Project. <URL:> Accessed 1 November 2011.


 Encyclopedia Britannica 2011. <URL:> Accessed 30 October 2011.


U.S. Fish and Wildlife Service: Endangered Species Program. 2003. <URL:> Accessed 3 November 2011.


Encyclopedia of Life. 2011. <URL:> 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:> Accessed 1 November 2011.



Sterki. 2007. Vertigo paradoxa: Mystery Vertigo. Michigan Natural Features Inventory. <URL:> 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:> 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.

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Wisconsin Land Snails


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