Common name: ghost rams-horn
available through www.itis.gov
Identification: Snails in the family Planorbidae have a discoidal shape and flattened spire, adults have 5 or more whorls (Burch and Tottenham 1980).
Size: Adults are usually less than 10 mm in diameter (Burch and Tottenham 1980)
Native Range: Southern Florida, central and southern Louisiana, and much of Texas (Malek 1969); Arizona, Mexico, and Central America (Bequaert and Miller 1973 as cited in Burch and Tottenham 1980); Puerto Rico and Cuba (Burch and Tottenham 1980).
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 Biomphalaria havanensis are found here.
Table last updated 5/25/2018
† Populations may not be currently present.
Ecology: Freshwater habitats
References: (click for full references)
Bequaert, J.C. and W.B. Miller. 1973. The molluscs of the arid Southwest, with an Arizona checklist. The University of Arizona Press, Tucson, xvi, 271 pp.
Bowler, P.A., and T.J. Frest. 1991. The non-native snail fauna of the middle Snake River, southern Idaho. Proceedings of the Desert Fishes Council 23:28-44.
Burch, J.B., and J.L. Tottenham. 1980. North American freshwater snails: species list, ranges and illustrations. Walkerana - Transactions of the POETS Society 1(3):81-215.
Malek, E.A. 1969. Studies on "tropicorbid" snails (Biomphalaria: Planorbdae) from the Caribbean and Gulf of Mexico areas, including the southern United States. Malacologia 7(2/3):183-209.
Revision Date: 11/1/2016
Benson, A.J., 2019, Biomphalaria havanensis (Pfeiffer, 1839): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=1030, Revision Date: 11/1/2016, Access Date: 2/18/2019
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.