Invasion

Invasion Description

1st Record: Alexandria (Hunters Point) /VA/Potomac River (Pilsbry 1927)

Geographic Extent

Alexandria (Hunters Point) /VA/Potomac River (Pilsbry 1927); Alexandria (Jones Point) /VA/Potomac Rive (Marsahll 1933)r; Mount Vernon/VA/Potomac River (Dundee 1974); Washington (Tidal Basin)/DC/Potomac River (Dundee 1974); Great Falls/VA/Potomac River (Hamilton 1979); Dickerson (Montgomery County)/MD/Potomac River (Fuller 1978); Plummers Island/MD/Potomac River (nontidal, 2004, Pearce and Evans 2008); Dyke Marsh/VA/Potomac River (1997, Fofonoff, personal observation); Elkridge/MD/Patapsco River (2006, Fofonoff, personal observation); Joppatown/MD/Gunpowder River (2004, Fofonoff, personal observation);; Buzzards Point/DC/Potima-Anacostia Rivers (17 Aug 2017. USNM USNM 1446243, U.S. National Museum of Natural History 2021).