Invasion

Invasion Description

1st Record? Humboldt County/CA/Eel River (USNM 129393, US National Museum of Natural History 2007; Riegel 1959, tidal occurrence not noted), 1st Record? Siskiyou County/CA/Klamath River (undated, USNM 131331, US National Museum of Natural History 2007, tidal occurrence not noted)

Geographic Extent

Humboldt County/CA/Eel River (USNM 129393, US National Museum of Natural History 2007; Riegel 1959, tidal occurrence not noted), Siskiyou County/CA/Klamath River (undated, USNM 131331, US National Museum of Natural History 2007, tidal occurrence not noted), Jackson County/OR/Rogue River (USNM 176784, US National Museum of Natural History 2007), Kelso/WA/Kalama River, Columbia River tributary (USNM 131325, US National Museum of Natural History 2007); WA-OR/Columbia River estuary (Sytsma et al. 2004); OR/Willamette River and adjacent Columbia Basin (Pearl et al. 2013, widespread), Otis/OR/Salmon River (USNM 144823, US National Museum of Natural History 2007)