Pomacea maculata
Pomacea maculata
(giant applesnail)
Mollusks-Gastropods
Exotic
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Pomacea maculata Perry 1810

Common name: giant applesnail

Synonyms and Other Names: Ampullaria insularum, Ampullaria gigas, Pomacea insularum

Identification: Typical applesnails are globular in shape. Normal coloration typically includes bands of brown, black, and yellowish-tan, and color patterns are extremely variable. Albino and gold color variations exist (R. Howells, pers. comm.).

Size: Can reach 155 mm in shell height (Pain, 1960 as cited in Cowie, 2002)

Native Range: Throughout much of tropical and subtropical South America (Hayes et al., 2012).

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Nonindigenous Occurrences: The first collection of this snail was in 1989 from two Palm Beach County, Florida locations. The earliest genetically confirmed specimen of P. maculata in Florida was collected from Lake Munson near Tallahassee, Florida collected in 2002 (Rawlings et al., 2007). At the time though, it was being referred to as P. insularum. Since then the Giant Applesnail has been recognized as present from much of Florida (D. Denson and L. Connor, pers. comm.). Outside of Florida, this snail has been found in Spring Hill Lake near Mobile, Alabama in 2003 (D. Shelton, pers. comm.); Alabaha River in Georgia in 2005 (B. Albanese, pers. comm.); American Canal and Mustang Bayou in Texas (Howells, 2001), and in 2006 in Verret Canal in Gretna, Louisiana and also Lajas Irrigation Canal in Puerto Rico (F. Grana, pers. comm.). More recently found in several locations in Mississippi in 2008 and 2009, South Carolina in 2010 and Arizona in 2011.

Ecology: This large snail is found in freshwater lakes, rivers, streams, ponds and ditches, preferring slow-moving water. Applesnails are tropical to subtropical organisms and cannot survive below 50°F in the winter (Florida DOACS, 2002).

The sexes are separate and fertilization is internal (Andrews, 1964). Bright pink egg masses are laid on emergent vegetation or manmade structures above the water. They are held in place when the secreted mucous dries (Andrews, 1964). Individual eggs are very small, approximately 1-2 millimeter in diameter. An egg mass may contain over 2000 eggs (Barnes et al., 2008). May reach 6 inches in shell height and is considered the largest snail on earth (Florida DOACS, 2002).

Means of Introduction: This species occasionally makes its way into the aquarium trade (Florida DOACS, 2002).

Status: Established in Florida, Georgia, Texas (Rawlings et al. 2007) and Louisiana, and most likely where there is evidence of egg masses, often first noticed prior to adults.

Impact of Introduction: Applesnails are known agricultural pests, feeding on rice crops and causing great economic damage (Cowie, 2002; Hayes et al., 2008). This species has been known to be a carrier of the rat lungworm parasite in New Orleans and Mandeville, Louisiana populations, but it is not widespread in the applesnail population (J. Teem, pers. comm.).

Remarks: Initially P. insularum had been identified as P. canaliculata in Florida, Georgia, and Texas. Genetic testing confirmed that specimens collected in Florida, Georgia, and Texas were P. insularum (Rawlings et al. 2007). Since then, P. insularum has been synonomized with P. maculata (Hayes et al., 2012).

References: (click for full references)

Andrews, E.B. 1964. The functional anatomy and histology of the reproductive system of some Pilid gastropod molluscs. Journal of Molluscan Studies 36(2):121-140.

Barnes, M.A., R.K. Fordham, R.L. Burks, and J.J. Hand. 2008. Fecundity of the exotic applesnail, Pomacea insularum. Journal of the North American Benthological Society 27(3):738-745.

Conner, L. Personal communication. Florida Fish and Wildlife Conservation Commission.

Cowie, R.H. 2002. Apple snails (Ampullariidae) as agricultural pests: their biology, impacts and management. Pages 145-192 in Barker, G.M., ed. Molluscs as Crop Pests. CABI Publishing, Wallingford, UK.

Denson, D. Personal communication. Florida Department of Environmental Protection.

Florida FDOACS. 2002. Applesnails. Technical Bulletin Number 3, 4 p. Accessed 6/28/2012 at http://edocs.dlis.state.fl.us/fldocs/doacs/aquaculture/techbull/2002no3.pdf

Grana, F. Personal communication. Puerto Rico Department of Natural and Environmental Resources.

Hayes, K.A., R.H. Cowie, S.C. Thiengo, and E.E. Strong. 2012. Comparing apples with apples: clarifying the identities of two highly invasive Neotropical Ampullaridae (Caenogastropoda). Zoological Journal of the Linnean Society 166(4):723-753.

Hayes, K.A., R.C. Joshi, S.C. Thiengo, and R.H. Cowie. 2008. Out of South America: multiple origins of non-native apple snails in Asia. Diversity and Distributions 14(4):701-712.

Howells, R. Personal communication. Texas Parks and Wildlife Department.

Howells, R. G. 2001. History and status of applesnail (Pomacea spp.) introductions in Texas. Texas Parks and Wildlife Department, Management Data Series No. 183.

Pain, T. 1960. Pomacea (Ampullariidae) of the Amazon River system. Journal of Conchology 24: 421-432.

Rawlings, T. A., K. A. Hayes, R. H. Cowie, and T. M. Collins. 2007. The identity, distribution, and impacts on non-native apple snails in the continental United States. BMC Evolutionary Biology, http://www.biomedcentral.com/1471-2148/7/97.

Shelton, D. Personal communication. Alabama Malacological Research Center.

Teem, J. Personal communication. Florida Dept. of Agriculture and Consumer Services.

Author: Benson, A.J.

Revision Date: 3/4/2014

Citation Information:
Benson, A.J., 2017, Pomacea maculata Perry 1810: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2633, Revision Date: 3/4/2014, Access Date: 11/18/2017

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.

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Citation information: U.S. Geological Survey. [2017]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [11/18/2017].

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