Pyganodon grandis
Pyganodon grandis
(giant floater)
Mollusks-Bivalves
Native Transplant
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6 results for Pyganodon grandis (giant floater)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1757715 NJCape MayCape May1957 02040302 Great Egg Harbor 
1757718 NJGloucesterAlmonesson, Gloucester, NJ1952 02040202 Lower Delaware 
887593 NJMercerDelaware and Raritan Canal, Princeton2000 02030105 Raritanestablished
1757716 NJMiddlesexRoosevelt County Park, Middlesex, NJ1955 02030104 Sandy Hook-Staten Island 
1714237 NJSomersetRaritan River Downstream of Island Farm Dam2023 02030105 Raritanunknown
1757717 NJUnionSuprise Lake, Watchung Reservation1955 02030105 Raritan 

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are 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 data.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [7/12/2025].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.