Invasion

Invasion Description

1st Record: Montgomery County/PA/Schuylkill River (1966, Academy of Natural Sciences of Philadelphia 1998)

Geographic Extent

Montgomery County/PA/Schuylkill River (1966, Academy of Natural Sciences of Philadelphia 1998); PA/Delaware River (Horwiz 1986); New Castle County/DE/Mill Creek (Raasch and Altemus 1991;)