Common name: mottled fingernailclam
available through www.itis.gov
Size: Small, 3-8 mm in length (Heard 1965)
Native Range: Fresh waters of the Atlantic drainage from Texas to North Carolina, and in Central and northern South America (Heard 1965).
Hydrologic Unit Codes (HUCs) Explained
Puerto Rico &
Interactive maps: Point Distribution Maps
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Eupera cubensis are found here.
Table last updated 12/5/2023
† Populations may not be currently present.
Means of Introduction: Unknown
Status: Established in Illinois.
Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.
References: (click for full references)
Heard, W. H. 1965. Recent Eupera (Pelecypoda: Sphaeriidae) in the United States. Am. Midl. Nat. 74(2):309-317.
Heard, W. H. 1977. Reproduction of fingernail clams (Sphaeriidae: Sphaerium and Musculium). Malacologia 16: 421-455.
Mackie, G. L. 2007. Biology of freshwater Corbiculid and Sphaeriid clams of North America. Ohio Biological Survey Bulletin New Series. Volume XV Number 3 ix+436 p.
Sneen, M. E., K. S. Cummings, T. Minarik, Jr., and J. Wasik. 2009. The discovery of the nonindigenous, mottled fingernail clam, Eupera cubensis (Prime, 1865) (Bivalvia: Sphaeriidae) in the Chicago Sanitary and Ship Canal (Illinois River Drainage), Cook County, Illinois. J. Great Lakes Res. 35(4):627-629.
Revision Date: 6/29/2023
Benson, A.J., 2023, Eupera cubensis: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2778, Revision Date: 6/29/2023, Access Date: 12/5/2023
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.