Invasion

Invasion Description

Type Locality: Philadelphia/PA/Schuyllkill River (Leidy 1851, cited by Wood 1991), MA-CT/Connecticut River (Smith 1980)

Smith, D. G. 1980 (Goniobasis virginica (Gastropoda: Pleuroceridae) in the Connecticut River. Nautilus 94: 50-54.)

Geographic Extent

near locks 5 and 23, Chesapeake & Ohio Canal/MD/Potomac River (Backus, Byron T. 1986, Karyology of the freshwater entoproct Urnatella gracilis. Transactions of the Americal Microscopical Society 105(1): 73-75.), Philadelphia/PA/Schuyllkill River (Leidy 1851, cited by Wood 1991)