[n = 23]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Canada | Yugoslavia | not established | |
| unknown | Unknown | Sweden | probably established | |
| unknown | Canada | Spain | not established | |
| unknown | Unknown | Latvia | probably established | |
| unknown | Unknown | North Korea | not established | |
| unknown | Unknown | Iran | probably established | unknown |
| 1901 - 1910 | USA | Chile | established | |
| 1960 - 1969 | USA | Italy | not established | unknown |
| 1980 - 1985 | Russia | Estonia | not established | none |
| 1980 - 1984 | France | Belgium | probably established | |
| 1859 | Unknown | Poland | probably not established | |
| 1904 | USA | Argentina | probably not established | |
| 1965 | Seattle, Washington | Japan | established | |
| 1969 | USA | South Korea | probably not established | probably some |
| 1971 | North America | France | established | unknown |
| 1974 | Canada | Cyprus | not established | |
| 1974 | USA | Germany | not established | |
| 1974 | Unknown | Greece | not established | |
| 1978 | USA | Kerguelen | established | probably some |
| 1982 | France | Netherlands | not established | |
| 1982 | Unknown | Jordan River | unknown | |
| 1982 | USA | Jordan River | probably not established | unknown |
| 1982 | USA | China | unknown |