Invasion

Invasion Description

!st Record: canal, Troy/NY/Hudson River (4/1879, #116841, University of Michigan Zoology Museum 2013), 1st Record: Alexandria (Hunters Point) /VA/Potomac River (Pilsbry 1927), 1st Record:Brandywine Creek Park near Wilmington water intake (1970, near route I-90= I-95?, , Academy of Natural Scences of Philadephia 2008);

Geographic Extent

canal, Troy/NY/Hudson River (4/1879, #116841, University of Michigan Zoology Museum 2013); Mohawk/NY/Mohawk River (1888, Strayer 1987, transplanted by a collector form Oswego NY, Lake Ontario); Dutchess County/NY/Hudson River (1892, Strayer 1897) Saratoga-Westchester Counties/NY/Hudson River (Strayer 1987, abundant); Poughkeepsie to Albany/NY/Hudson River (2008, Coote and Strayer 2009, only one specimen); Cruger Island, Dutchess County/NY/Hudson River (1996, USNM 883969, US National Museum of Natural History 2008; Strayer and Smith 2000), 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)., Brandywine Creek Park near Wilmington water intake (1970, near route I-90= I-95?, , Academy of Natural Scences of Philadephia 2008); Port Jervis/NY/Delaware Eiver (1999, USGS Nonindigenous Aquatic Species Program)