Invasion

Invasion Description

None

Geographic Extent

Herald Harbor/MD/Severn River (USNM 367190, US National Museum of Natural History 2009); Galesville/MD/West River (Allen 1954); Little Choptank River/MD/Bequaert 1943); Colonial Beach/VA/Potomac River (USNM 473887, US National Museum of Natural History 2009); Fairport/VA/Piankatank River (USNM 103259, US National Museum of Natural History 2009)