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Chthamalus fragilis
Image courtesy of Sierra J. Jones, University of South Carolina
Chthamalus fragilis
Taxonomic Group: Crustaceans-Barnacles


Chthamalus fragilis is a small grey barnacle (up to 9 mm in size) first described from Charleston, South Carolina. Its native range extends from New Jersey to Mexico. It is introduced in Southern New England and is found from Long Island Sound to Cape Cod. The northern range limit of C. fragilis appears to be set by temperature and competition with the barnacle Semibalanus balanoides. In its native range C. fragilis is found on a wide range of habitats, including marsh grasses and rock, but in its introduced range it is limited to the upper rocky intertidal. There are no reported impacts of C. fragilis from its introduced range.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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