Invasion

Invasion Description

1st Record: Albany/NY/Hudson River (Marshall 1895, cited by Strayer 1987).

1st Watershed Record: Herkimer County/NY/Mohawk River (1867, Jokinen 1992, 200 specimens from Illinois released by collector). Not found in a 2008 survey of the upper tidal river (Coote and Strayer 2008), 1st Record: Alexandria (Hunters Point)/VA/Potomac River (1901, US National Museum of Natural History Colections, as V. viviparus). No recent records?, 1st Record: Fairmont Park (Philadelphia)/PA/Delaware River (1909, Clench 1962; ANSP 98696, A9232, Academy of Natural Sciences of Philadelphia 2014)

Geographic Extent

Herkimer County/NY/Mohawk River (1867, Jokinen 1992, 200 specimens from Illinois released by collector); Albany/NY/Hudson River (Marshall 1895, cited by Strayer 1987); Dutchess County/NY/Hudson River (1926, Strayer 1987); Annandale/NY/Sawkill River (1922, Strayer 1987); New York City/NY/park pond (Clench 1962), Seneca/MD/Potomac River (nontidal, (Clench 1962, Dundee 1974, US National Museum of Natural History Colections); Great Falls/MD/Potomac River (nontidalClench 1962, Dundee 1974, US National Museum of Natural History Colections); Washington/DC/Potomac River (Richards 1934; Clench 1962, Dundee 1974, US National Museum of Natural History Colections); Alexandria (Hunters Point)/VA/Potomac River (1901, US National Museum of Natural History Colections, as V. viviparus); Alexandria /VA/Potomac River (Little Hunting Creek, US National Museum of Natural History Colections, as V. viviparus) Mount Vernon/VA/Potomac River (Clench 1962, Dundee 1974, US National Museum of Natural History Colections);, Riverton (Burlington County)/NJ/Delaware River (Clench 1962); Fairmont Park, Philadelphia/PA/Delaware River (1909, Clench 1962; ANSP 98696, A9232, Academy of Natural Sciences of Philadelphia 2014); NY-PA-NJ/Delaware River Basin (Bilger et al. 2005)