[n = 6]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | USA | British Columbia | established | unknown |
| unknown | Unknown | Baja California | established | |
| unknown | Unknown | Kamchatka, Poluostrov | probably established | |
| unknown | Unknown | Alaska | probably not established | |
| 1928 - 1929 | USA | Japan | not established | |
| 1970 - 1979 | Unknown | Germany | not established | unknown |