References
Catalogue of
life: 2009 Annual Checklist.
Web. 20 Mar. 2011.
<http://www.catalogueoflife.org/annual-checklist/2009/
show_species_details.php?record_id=855257>.
"Discus patulus (Domed disc)." Michigan
State University Extension. Web. 28 Mar. 2011.
<http://web4.msue.msu.edu/mnfi/explorer/
species.cfm?id=12469>.
Hotopp K., T. Pearce and
D. Dourson. 2008. Land Snails of the Cheat River Canyon, West
Virginia (Gastropoda: Pulmonata).
Virginia Natural History Society 31:
40-46.
Land Snails of Wisconsin. University of Wisconsin La Crosse,
Web. 25 Mar. 2011.
<http://www.uwlax.edu/biology/faculty/perez/Perez/PerezLab/
Research/WIsnailslist.htm>.
Nekola
J.C. 2003. Large-scale terrestrial gastropod community
composition patterns in the Great Lakes region of North
America.
Diversity and Distributions 9: 55-71.
Nekola J.C. 2009. Acidophilic Terrestrial
Gastropod Communities of North America. Oxford University Press
76: 144–156.
<http://snailstales.blogspot.com/
2006/05/north-american-land-snails-discus.html>.
Pilsbry, H.A. 1948. Land
Mollusca of North America. Monographs of the Academy of Natural Sciences of Philadelphia, 3 (1-4)
: 2215
Watters G.T. , T. Menker
and S. O’Dee. 2004. A comparison of terrestrial snail faunas
between strip-mined land and
relatively undisturbed land
in Ohio, USA – an
evaluation of recovery potential and changing faunal
assemblages.
Biological Conservation
126 (2)
:166-174.