Invasion

Invasion Description

1st Record: Bucks County/PA/Delaware River; mouth of U.S. Steel discharge ditch (off buoy 85) (1971, ANSP 172707, Academy of Natural Sciences of Philadelphia 2014) 1st Nontidal Record? DE/unspecified ponds(1952, Raasch and Altemus

Geographic Extent

Philadelphia-Camden/PA-NJ/Delaware River (1977, Horwitz 1986); Bucks County/PA/Delaware River; mouth of U.S. Steel discharge ditch (off buoy 85) (1971, ANSP 172707, Academy of Natural Sciences of Philadelphia 2014); Croydon/PA/Mouth of Neshaminy Creek 100 yds. upstream of Buoy 33, Delaware River (1972, ANSP 172704, Academy of Natural Sciences of Philadelphia 2014); just upstream from Trenton/NJ/Delaware River at Scudders Falls (1982, USNM 395707, U.S. National Museum of Natural History 2014)