USGS Fact Sheet 2008-3006

Red-Rimmed Melania (Melanoides tuberculatus)—A Snail in Biscayne National Park, Florida—Harmful Invader or Just a Nuisance?

By G. Lynn Wingard, James B. Murray, W. Bane Schill, and Emily C. Phillips

U.S. Geological Survey Fact Sheet 2008-3006, 6 pages (Published online, May 2008)

This report is available in PDF format: Fact Sheet 2008-3006 (Opens the PDF file in a new window. ) (1.5 MB)

Cover thumbnailPotentially harmful to humans and other animals, the red-rimmed melania snail (Melanoides tuberculatus; family Thiaridae) was discovered in Biscayne National Park, Florida, in 2003 by U.S. Geological Survey (USGS) researchers. The discovery raised concerns for park managers because this aquatic non-native snail is present in significant numbers in areas frequently used by park visitors and poses a risk of exposure. Researchers are addressing questions such as: Is this species a danger to human health? How widespread is it within the park? What factors control the distribution of the species? Is its presence a threat to native animals?

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Suggested citation: Wingard, G.L., Murray, J.B., Schill, W.B., and Phillips, E.C., 2008, Red-rimmed melania (Melanoides tuberculatus)—A snail in Biscayne National Park, Florida—Harmful invader or just a nuisance?: U.S. Geological Survey Fact Sheet 20083006, 6 p. (available online at

For more information, please contact G. Lynn Wingard.

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