Common name: Charru mussel
Synonyms and Other Names: M. falcata, M. strigata, M. arciformis
Size: 25 mm
Native Range: Coast of South America.
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 Mytella charruana are found here.
Table last updated 8/12/2022
† Populations may not be currently present.
Means of Introduction: Unknown. Probable ballast water introduction.
Status: The mussel has disappeared from the Jacksonville area. No new sightings have been reported there since 1986. However, it appears that a new population may be established in the Mosquito Lagoon area of east-central Florida where juvenile mussels were collected in 2004.
Impact of Introduction: This species created a biofouling problem at the Jacksonville Electric Authority's Northside Generating Station by clogging an intake pipe filter just feet away from steam condensers. The mussels in Mosquito Lagoon were collected off a reef where they could compete with native organisms for food and habitat.
References: (click for full references)
Keen, A.M. 1971. Sea shells of tropical west America. Second edition. Stanford University Press, California, 1064 p.
Revision Date: 10/21/2004
Benson, A.J., 2022, Mytella charruana (d'Orbigny, 1846): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=106, Revision Date: 10/21/2004, Access Date: 8/12/2022
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.