Invasion

Invasion Description

1st Established Record: CA/Humboldt Bay (northeast portion, Klopp Lake, Southport Landing, Mad River Slough) (Miller et al. 1999; Boyd et al. 2002)

1st Record (Extinct) OR/Pony Slough, Coos Bay (1963, 2 specimens; 1965, 3 specimens + 2 valves; Keen 1969, cited by Carlton 1979). Not collected since 1965 (Carlton 1989).

Geographic Extent

WA/Willapa Bay (1998, Chapman, pers. comm., cited by Boyd 2002; Wonham and Carlton 2005); off Siltcoos/OR/ Pacific Ocean (GBIF 2022)l OR/Pony Slough, Coos Bay (1963, Keen 1969, Carlton 1979; not collected since 1965, Carlton 1989); off Siltcoss/OR/CA/Humboldt Bay (northeast portion, Klopp Lake, Southport Landing, Mad River Slough) (Miller et al. 1999; Boyd et al. 2002, established)