| Species |
Recipient region |
Date of the first record |
|
| Rachycentron canadum | Israel | 1978 |  |
| Radicilingua thysanorhizans | France / Western Mediterranean | 1969 | |
| Raeta pulchella | Australia / Bass strait | 1991 | |
| Rangia cuneata | Belgium | 2005 | |
| Rangia cuneata | Estonia | 2014 | |
| Rangia cuneata | Finland | 2021 | |
| Rangia cuneata | France / English Channel | 2017 | |
| Rangia cuneata | France / North Sea | 2005 | |
| Rangia cuneata | Germany / Baltic Sea | 2014 - 2015 | |
| Rangia cuneata | Germany / North Sea | 2013 | |
| Rangia cuneata | Lithuania | 2013 | |
| Rangia cuneata | Netherlands | To 2005 | |
| Rangia cuneata | Poland | 2011 | |
| Rangia cuneata | Russia / Baltic Sea / Kaliningrad area | 2010 | |
| Rangia cuneata | Sweden / Baltic Sea | 2016 | |
| Rapana venosa | Belgium | To 2006 | |
| Rapana venosa | Bulgaria | 1956 | |
| Rapana venosa | France / Biscay Gulf | 1997 | |
| Rapana venosa | France / Celtic seas | 1998 | |
| Rapana venosa | France / Western Mediterranean | 2015 | |
| Rapana venosa | Georgia | 1947 | |
| Rapana venosa | Greece / Eastern Mediterranean | 1986 | |
| Rapana venosa | Italy / Adriatic Sea | 1973 | |
| Rapana venosa | Italy / Central Mediterranean | To 2006 | |
| Rapana venosa | Italy / Western Mediterranean | 1978 | |
| Rapana venosa | Netherlands | 2005 | |
| Rapana venosa | Romania | From 1961 | |
| Rapana venosa | Russia / Black Sea | 1946 | |
| Rapana venosa | Spain / Iberian Coastal | 2007 | |
| Rapana venosa | Turkey / Black Sea | 1960 | |
| Rapana venosa | Ukraine / Black Sea | From 1954 | |
| Rapana venosa | United Kingdom (Britain) / North Sea | 2005 | |
| Rastrelliger kanagurta | Israel | 1967 | |
| Rathkea octopunctata | Romania | From 1959 | |
| Redicirce sulcata | Israel | 1970 | |
| Reptadeonella violacea | Portugal / Iberian Coastal | 2012 | |
| Reptadeonella violacea | Portugal / Madeira | To 2013 | |
| Reptadeonella violacea | Spain / Canary Islands | To 2003 | |
| Reteporella jermanensis | Israel | 1974 | |
| Retusa desgenettii | Israel | 1997 | |
| Rhabdosargus haffara | Israel | 1991 | |
| Rhincalanus sp. | Ukraine / Black Sea | From 1997 | |
| Rhinoclavis kochi | Greece / Eastern Mediterranean | 2015 | |
| Rhinoclavis kochi | Israel | 1963 | |
| Rhinoclavis sinensis | Israel | 2003 | |
| Rhithropanopeus harrisii | Belgium | 1985 | |
| Rhithropanopeus harrisii | Bulgaria | 1934 | |
| Rhithropanopeus harrisii | Denmark / Baltic Sea | 1953 | |
| Rhithropanopeus harrisii | Denmark / North Sea | 1953 | |
| Rhithropanopeus harrisii | Estonia | 2011 | |
| Rhithropanopeus harrisii | Finland | 2009 | |
| Rhithropanopeus harrisii | France / Biscay Gulf | 1955 | |
| Rhithropanopeus harrisii | France / Celtic seas | 1959 | |
| Rhithropanopeus harrisii | France / English Channel | 1955 | |
| Rhithropanopeus harrisii | France / North Sea | 1950 | |
| Rhithropanopeus harrisii | France / Western Mediterranean | To 2001 | |
| Rhithropanopeus harrisii | Germany / Baltic Sea | 1948 - 1950 | |
| Rhithropanopeus harrisii | Germany / North Sea | 1910 - 1914 | |
| Rhithropanopeus harrisii | Italy / Adriatic Sea | 1993 | |
| Rhithropanopeus harrisii | Italy / Western Mediterranean | 2013 | |
| Rhithropanopeus harrisii | Latvia | 2013 | |
| Rhithropanopeus harrisii | Lithuania | 2001 | |
| Rhithropanopeus harrisii | Netherlands | 1874 | |
| Rhithropanopeus harrisii | Poland | 1951 | |
| Rhithropanopeus harrisii | Portugal / Iberian Coastal | To 1978 | |
| Rhithropanopeus harrisii | Romania | From 1951 | |
| Rhithropanopeus harrisii | Russia / Azov Sea | 1950 | |
| Rhithropanopeus harrisii | Russia / Baltic Sea / Kaliningrad area | 1950 | |
| Rhithropanopeus harrisii | Spain / Iberian Coastal | To 1991 | |
| Rhithropanopeus harrisii | Sweden / Baltic Sea | 2014 | |
| Rhithropanopeus harrisii | Ukraine / Black Sea | 1937 - 1948 | |
| Rhithropanopeus harrisii | United Kingdom (Britain) / Celtic seas | 1996 | |
| Rhizogeton nudus | Iceland | To 2010 | |
| Rhizogeton nudus | Norway / Barents Sea | To 1998 | |
| Rhizogeton nudus | United Kingdom (Britain) / North Sea | To 2010 | |
| Rhizosolenia setigera | Bulgaria | 1987 | |
| Rhizosolenia setigera | Georgia | 1989 | |
| Rhizosolenia setigera | Romania | 1987 | |
| Rhodophysema georgei | France / Western Mediterranean | 1978 | |
| Rhodosoma turcicum | Israel | 2004 | |
| Rhopilema nomadica | Greece / Central Mediterranean | 2006 | |
| Rhopilema nomadica | Greece / Eastern Mediterranean | 2017 | |
| Rhopilema nomadica | Israel | 1976 | |
| Rhopilema nomadica | Italy / Central Mediterranean | 2015 | |
| Rhopilema nomadica | Italy / Western Mediterranean | 2015 | |
| Rhynchoconger trewavasae | Israel | 1987 | |
| Rissoina bertholleti | Israel | 1958 | |
| Rissoina spirata | Israel | 1997 | |
| Robertgurneya ecaudata | Ukraine / Black Sea | 1969 | |
| Robertgurneya rostrata | Turkey / Black Sea | 2009 | |
| Robertgurneya rostrata | Ukraine / Black Sea | From 1964 | |
| Ruditapes decussatus | Portugal / Azores | To 1900 | |
| Ruditapes philippinarum | Belgium | To 2006 | |
| Ruditapes philippinarum | France / Biscay Gulf | 1976 | |
| Ruditapes philippinarum | France / Celtic seas | 1979 | |
| Ruditapes philippinarum | France / English Channel | 1973 | |
| Ruditapes philippinarum | France / North Sea | 2009 | |
| Ruditapes philippinarum | France / Western Mediterranean | 1981 | |
| Ruditapes philippinarum | Germany / North Sea | 2016 | |
| Ruditapes philippinarum | Ireland | 1982 | |
| Ruditapes philippinarum | Italy / Adriatic Sea | 1983 | |
| Ruditapes philippinarum | Italy / Central Mediterranean | 1983 - 1990 | |
| Ruditapes philippinarum | Italy / Western Mediterranean | 1985 | |
| Ruditapes philippinarum | Netherlands | To 2008 | |
| Ruditapes philippinarum | Norway / North Sea | 1987 | |
| Ruditapes philippinarum | Norway / Norwegian Sea | 1987 | |
| Ruditapes philippinarum | Portugal / Iberian Coastal | To 1984 | |
| Ruditapes philippinarum | Romania | 1985 | |
| Ruditapes philippinarum | Russia / Black Sea | 1985 | |
| Ruditapes philippinarum | Spain / Iberian Coastal | To 2005 | |
| Ruditapes philippinarum | United Kingdom (Britain) / Celtic seas | 1980 | |
| Ruditapes philippinarum | United Kingdom (Britain) / English Channel | 1980 | |
| Ruditapes philippinarum | United Kingdom (Britain) / North Sea | 1981 - 1987 | |
| Rugalucina angela | Israel | 2016 | |
| Rugulopteryx okamurae | France / Western Mediterranean | 2002 | |
| Rugulopteryx okamurae | Italy / Adriatic Sea | 2023 | |
| Rugulopteryx okamurae | Italy / Central Mediterranean | 2024 | |
| Rugulopteryx okamurae | Italy / Western Mediterranean | 2023 | |
| Rugulopteryx okamurae | Portugal / Iberian Coastal | 2021 | |
