References
Body parts and organs. The living world of mollusks. http://www.weichtiere.at/english/gastropoda/terrestrial/escargot/morphology.html. Accessed March 31, 2011.
Brilliant Granule (Guppya sterkii). 2009. Wisconsin Department of Natural Resources. http://dnr.wi.gov/org/land/er/biodiversity/index.asp?mode=info&Grp=24&SpecCode=IMGAS71030. Accessed March 7, 2011.
Genus Guppya. 2008. University of Michigan Museum of Zoology, Animal Diversity Web. http://animaldiversity.ummz.umich.edu/site/accounts/classification/Guppya.html
Grimm, F.W., R.G. Forsyth, F.W. Schuler, and A. Karstad. 2009. Identifying land snails and slugs in Canada. Fieldiana Zoology 24: 65.
Guppya sterkii. 2007. Michigan Natural Features Inventory. http://web4.msue.msu.edu/mnfi/explorer/species.cfm?id=12483. Accessed March 31, 2011.
Guppya sterkii. 2009. BayScience Foundation. http://zipcodezoo.com/Animals/G/Guppya_sterkii/. Accessed March 7, 2011.
Hubricht, L. 1985. The distribution of the native land mollusks of the Eastern United States. Canadian Food Inspection Agency A104-77/2009E: 142.
Nekola, J. 2000. Distribution and ecology of Vertigo cristata (Sterki, 1919) in the Western Great Lakes Region. American Malacological Bulletin 16: 47-52.
Nekola, J. 2003. Large-scale terrestrial gastropod community composition patterns in the Great Lakes region of North America. Diversity and Distributions 9: 55-71.
Nekola, J. 2004. Terrestrial gastropod fauna of Northeastern Wisconsin and the Southern Upper Peninsula of Michigan. American Malacological Bulletin 18: 21-44.
What do snails eat? 2011. About.com. http://animals.about.com/od/mollusks/ig/World-of-Snails/Snail-7.htm. Accessed March 31, 2011.
Links to other snails:
http://www.uwlax.edu/biology/faculty/perez/Perez/PerezLab/Research/WIsnailslist.htm)