References

Baker, F.C. The Molluscan Family Planorbidae. 1945. The University of Illinois Press Urbana. 3-153.

Belden, L.K. and J.M. Kiesecker. 2005. Glucocorticosteroid Hormone Treatment of Larval Treefrogs Increases infection by Alaria Sp. Trematode Cercariae.  The Journal of Parasitology. 91:686-687.

Bunkley-Williams, L., E.H. Williams. 1994. Parasites of Puerto Rican Freshwater Sport Fishes. 1-161.

Cawley, K. 2011. URL<http://archives.nd.edu/latgramm.htm>. Accessed 10 November 2011.

Encyclopedia of Life. 2011. URL<http://eol.org/pages/455664/overview>. Accessed 7 November 2011.

Hickman, C.P., L. Roberts, S. Keen, A. Larson, D.J. Eisenhour. 2009. Animal Diversity. 5th Ed. Boston: McGraw Hill Higher Education. 178-191.

Kiesecker, J.M. 2002. Synergism between trematode infection and pesticide exposure: A link to amphibian limb deformities in nature? PNAS. 99:9900-9904.

Lodge, D.M., M.W. Kershner, J.E. Aloi., A.P. Covich. 1994. Effects of an omniverous crayfish (Oreconectes Rusticus) on a freshwater littoral food web. Ecology. 75:1265-1281.

Martin, S.M. Freshwater Snails (Mollusca:Gastropoda) of Maine. 1999. Northeastern Naturalist. 6:39-88.
 
O'neil, R.P and G.J. Soulliere. 2006. Conservation Guidelines for Michigan Lakes. Department of Natural Resources. 67.

Perez, K.E., S. Clark and C. Lydeard. Freshwater Gastropod Identification Workshop. 2004. 40-42.

Prescott, D.R.C. and M.M., Curteanu. 2004. Survey of Aquatic Gastropods in the Central Parkland Subregion of Alberta. Alberta Sustainable Resource Development. 37.
 
Pyron, M., J. Beugly, M. Spielman, J. Pritchett and S. Jacquemin. 2009. Habitat vatiation among aquatic Gastropod assemblages of Indiana, USA. The Open Zoology Journal. 2:8-14.
 
Sitnikova, T., E. Soldatenko, R. Kamaltynov. and F. Riedel.  The finding of North American Freshwater gastropods of the genus Planorbella Haldeman, 1842 (Pulmonata:Planorbidae) in East Siberia. 2010. Aquatic Invasions. 5: 201-205.
 
Sturm, C.F., T.A. Pearce and A. Valdes. 2006. The Mollusks: A Guide to their study, collection and preservation. American Malacological Society. 252-258.
 
Walker, B. A Synopsis of the Classification of the Freshwater Mollusca of North American, North of Mexico. 1918. University of Michigan. 12-13.

Wilson, R. 2011. URL<http://naturalaquariums.com> Accessed 10 Novemeber 2011.
 
Winslow, M.L. The Varieties of Planorbis campanulatus say. 1926. University of Michigan. 1-2.
 
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