Invasion

Invasion Description

1st Non-Native Record: Haverstraw/NY/Hudson River (1937, Jacobson 1952)

Geographic Extent

Non-Native Range: Edgewood Park, New Haven/CT/Duck Pond, West River (2015, Richardson and Hammond 2016); Shelton/CT/Housatonic River (1992, Smith and Boss 1995); Newburgh, River Km 99/NY/Hudson River (1992, Walton 1996, upstream record); Haverstraw/NY/Hudson River (1937, Jacobson 1953); Croton Point Park/NY/Hudson River (1952, Jacobson 1953); Tarrytown/NY/Hudson River (1992, Walton 1996); Engelwood/NJ/Hudson River (River Km 24, 1953, Jacobson 1953); Harmon/NY/Hudson River (1952, ANSP 189398, Academy of Natural Sciences of Philadelphia 2008); River Km 55-87/NY/Hudson River (Ristich et al. 1977); Tappan Zee Bridge/NY/Hudson River (River Km 44, 2006,-2009, New York State Department of Transportation 2012)

Native Range: Baltimore/MD/Patapsco River (Bergstrom 2004); Glen Burnie/MD/Magothy River (Bergstrom 2004); Kent County, near Chestertown/MD/Morgan Creek, off Chester River (A15150, Academy of Natural Sciences of Philadelphia 2012); Chestertown/MD/Chester River (Bergstrom 2004); Severna Park/MD/Severn River (Bergstrom 2004); Riva/MD/South River (Bergstrom 2004); Deepwater Shoal to Wreck Shoal/VA/James River (Larsen 1985); 2 mi N of Bacon's Castle/VA/James River (MCZ 186891, Museum of Comparative Zoology 2008)
Note: No collections from the Delaware River, even at the Academy of Natural Sciences of Philadelphia or in species lists for the river (Crumb 1977; Bilger et al. 2005)