Taxonomy Search:

Megabalanus coccopoma
Image courtesy of Jo O'Keefe,
Megabalanus coccopoma
Taxonomic Group: Crustaceans-Barnacles


The Titan Acorn Barnacle, Megabalanus coccopoma, is a large barnacle growing up to 5 cm in height and width. It is native to the Eastern Pacific, ranging from Mexico to Peru. In the United States, it was first reported as introduced in Louisiana in 2001 and its non-native range now extends throughout the Gulf of Mexico and along the Atlantic coast of Florida, Georgia, South Carolina and North Carolina. Elsewhere in the world, introduced populations have been reported from Belgium, the Netherlands, West Africa, Brazil, Australia and Japan. Megabalanus coccopoma is currently rare in US waters; however, within its native range, from Mexico to Peru, it is a common fouling species on boats, ships, buoys, and other man-made structures.

This is some default tab content, embedded directly inside this space and not via Ajax. It can be shown when no tabs are automatically selected, or associated with a certain tab, in this case, the first tab.


Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
Access Date:

Marine Invasions Lab
Smithsonian Environmental Research Center

P.O. Box 28
647 Contees Wharf Road
Edgewater, MD 21037-0028 Tel: 443 482 2200
Fax: 443 482 2380

Databases Overview| Chesapeake Bay | National Database |