Common name: olive mysterysnail
available through www.itis.gov
Identification: A large snail with a broadly globose conic shape, which may have 3 dark colored bands but not always (Burch and Tottenham, 1980).
Size: 33 mm shell height (Clench and Fuller, 1965)
Native Range: Mississippi River drainage from Iowa and Illinois to Louisiana, and in the Gulf drainage in east Texas, west Louisiana, and east Mississippi (Clench and Fuller, 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 Viviparus subpurpureus are found here.
Table last updated 9/30/2019
† Populations may not be currently present.
Ecology: The olive mysterysnail inhabits freshwater streams, ponds, lakes, and marshes.
The sexes are separate and the females give birth to live young.
Means of Introduction: It is difficult to determine the pathway of introduction for native species not known to be in the aquarium trade. Because the native range is relatively close, these reservoir introductions most likely are the result of unintentional release of water containing small snails through recreational activities.
Status: Unknown in its invaded range.
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)
Burch, J.B. and J.L. Tottenham. 1980. North American freshwater snails: species lists, ranges and illustrations. Walkerana 1(3):81-215.
Clench, W.J., and S.L.H. Fuller. 1965. The genus Viviparus (Viviparidae) in North America. Occasional Papers on Mollusks 2(32):385-412.
Dillon, R.T., Jr., B.T. Watson, T.W. Stewart and W.K. Reeves. 2006. The freshwater gastropods of North America. Available from: http://www.fwgna.org/FWGSC/viviparus.pdf
Revision Date: 6/3/2013
Benson, A.J., 2020, Viviparus subpurpureus: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2769, Revision Date: 6/3/2013, Access Date: 1/19/2020
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.