References:

 

Scholarly Articles:

Hickman, C.P. 2009. "Class Gastropoda." Animal Diversity. 5th ed. Boston: McGraw-Hill Higher Education. Print. Pages: 179 and 186-189.

Martin, S. 2000. Terrestrial Snails and Slugs (Mollusca: Gastropoda) of Maine. Northeastern Naturalist 7(1).  Accessed 20 October 2011.

Nekola, J.C.. 2002. Large-scale terrestrial gastropod community composition patterns in the Great Lake region of North America. Diversity and Distributions 9. Accessed 4 October 2011.

Nekola, J.C.. 2003. Terrestrial gastropod fauna of Northeastern Wisconsin and the Southern Upper Peninsula of Michigan. American Malacological Bulletin 18. Page 18. Accessed 4 October 2011.

Riddle, W. and Miller, v. 1988. Cold-Hardinesss in Several Species of Land Snails. Journal of Thermal Biology 13-4. Page 165. Accessed 13 October 2011.

Websites:

Carnegie Museum of Natural History 2005. <URL: http://www.carnegiemnh.org/mollusks/palandsnaills/di_cats.html>. Accessed 7 October 2011.

Encyclopedia Britannica 2011. <URL: http://www.britannica.com/EBchecked/topic/22677/gastrod/35711/Reprodcution-and-life-cycles>. Accessed 20 October 2011.

Encyclopedia of Life: Volume 2.0. <URL: http://eol.org/>. Accessed 7 October 2011.

Global Species 2011. <URL: http://globalspecies.org/ntaxa.1045075>. Accessed 20 October 2011.

ITIS 2011. <URL: http://www.itis.gov/servelt/SingleRpt/SingleRpt>. Accessed 20 October 2011.

Montana Field Guides 2011. <URL: http://fieldguide.mt.gov/detail_IMGAS54120.aspx>. Accessed 7 October 2011.

U.S. Fish & Wildlife Service: Endangered Species 2011. <URL: http://www.fws.gov/midwest/endangered/Snails/iops_fct.html>. Accessed 20 October 2011.

Pictures:

Dillon, R. 2011. Discover Life. <URL: http://www.discoverlife.org/20/q>.

Nekola, J. and Matt Kuchta 2011. Land Snails of Wisconsin. <URL: http://www.uwlax.edu/biology/faculty/perez/Perez/PerezLab/Research/WIsnailslist.htm>. Accessed 20 October 2011.

Ripka, K. 2010. Land Snails and Slugs of Pennsylvania and New York: Discus catskillensis: Angular Disc. <URL: http://leaflittercritters.blogspot.com/2010/11/discus-catskillensis-anuglar-disc.html>. Accessed 7 October 2011.