Invasion

Invasion Description

1st record: Oakland/CA/Oakland Harbor, San Francisco Bay (1895, Torrey 1902, cited by Carlton 1979; USNM 43476, US National Museum of Natural History 2011)

Geographic Extent

Oakland/CA/Oakland Harbor, San Francisco Bay (1895, Torrey 1902, cited by Carlton 1979; USNM 43476, US National Museum of Natural History 2011); CA/San Francisco Bay (Fraser 1937; 'still occurs', Carlton 1979; no records in 50+ years, not found in 1993 and 2004 surveys, Carlton 2007, personal communication)