Invasion

Invasion Description

1st Record: This mussel has been found in recent excavations of pre-Columbian archaeological sites on Chesapeake Bay and thus appears to be native to the Bay (Rick Torben, US National Museum of Natural History, unpublished data).

Geographic Extent

Hacketts Bar/MD/Annapolis Harbor, Severn River (1950, Allen 1960); Kent County/MD/mouth of Chester River (1995, Ruiz et al. unpublished data); Queen Anne County/MD/Chester River (1930, Academy of Natural Sciences of Philadelphia 2002); Cambridge/MD/Choptank River (Humphries et al. 1985); Calvert Cliffs/MD/Chesapeake Bay (Abbe 1987); Eagle Bridge-Solomons/MD/Patuxent River (Cory 1967); MD/Smiths Creek, Potomac River (1883, ANSP 110458, Academy of Natural Sciences of Philadelphia 2002); Point Lookout/MD/ Potomac River-Chesapeake Bay (1886, USNM collections); 16-60 km from mouth/Rappahannock river (Davies 1972); Norfolk/VA/Hampton Roads (Calder 1966)