Invasion

Invasion Description

1st Record: OR/Coos Bay (1963, 2 specimens 'in marsh channels', 1965, 3 specimens + 2 valves, in Pony Slough Keen 1969, cited by Carlton 1979)

Geographic Extent

OR/Pony Slough, Coos Bay (1963, Keen 1969, cited by Carlton 1979; not collected since 1965, Carlton 1989)