| Species |
Recipient region |
Date of the first record |
|
| Spermothamnion cymosum | Italy / Adriatic Sea | 2010 |  |
| Sphacelaria fusca | Australia / Bass strait | 1977 | |
| Sphaerococcus coronopifolius | Norway / North Sea | 1994 | |
| Sphaerococcus coronopifolius | Sweden / North Sea | To 1994 | |
| Sphaeroma serratum | Portugal / Azores | To 1990 | |
| Sphaeroma walkeri | France / Western Mediterranean | 1977 | |
| Sphaeroma walkeri | Greece / Eastern Mediterranean | 2015 | |
| Sphaeroma walkeri | Israel | 1971 | |
| Sphaeroma walkeri | Italy / Western Mediterranean | 2010 | |
| Sphaeroma walkeri | Portugal / Madeira | From 2015 | |
| Sphaeroma walkeri | Romania | 2004 | |
| Sphaerotrichia divaricata | France / Western Mediterranean | 1981 | |
| Sphaerotrichia divaricata | Portugal / Azores | 1991 | |
| Sphaerotrichia firma | France / Western Mediterranean | 1980 | |
| Sphenia rueppellii | Israel | 1978 | |
| Sphoeroides pachygaster | France / Western Mediterranean | 1991 | |
| Sphyraena chrysotaenia | Greece / Central Mediterranean | 2011 | |
| Sphyraena chrysotaenia | Greece / Eastern Mediterranean | 1995 | |
| Sphyraena flavicauda | Greece / Eastern Mediterranean | 2003 | |
| Sphyraena flavicauda | Israel | 1991 | |
| Sphyraena obtusata | Ukraine / Black Sea | From 1999 | |
| Sphyraena pinguis | Israel | 1931 | |
| Sphyrna zygaena | Romania | 1950 - 1959 | |
| Spirobranchus latiscapus | Spain / Iberian Coastal | To 2017 | |
| Spirobranchus tetraceros | Greece / Eastern Mediterranean | 1970 | |
| Spirobranchus tetraceros | Israel | 1976 | |
| Spirobranchus tetraceros | Italy / Central Mediterranean | 2016 | |
| Spirorbis (Spirorbis) marioni | France / Western Mediterranean | 1977 | |
| Spirorbis (Spirorbis) marioni | Greece / Eastern Mediterranean | 1997 | |
| Spirorbis (Spirorbis) marioni | Italy / Western Mediterranean | 1977 | |
| Spirorbis (Spirorbis) marioni | Portugal / Azores | To 1979 | |
| Spirorbis (Spirorbis) marioni | Portugal / Madeira | To 1995 | |
| Spirorbis (Spirorbis) marioni | Spain / Canary Islands | To 1980 | |
| Spisula solidissima | Netherlands | 1982 | |
| Spondylus nicobaricus | Israel | 2002 | |
| Spondylus spinosus | Greece / Eastern Mediterranean | 2008 - 2013 | |
| Spondylus spinosus | Israel | 1992 | |
| Spongoclonium caribaeum | France / Celtic seas | 1967 | |
| Spongoclonium caribaeum | France / English Channel | 1967 | |
| Spongoclonium caribaeum | France / Western Mediterranean | 1974 | |
| Spongoclonium caribaeum | Portugal / Azores | 2005 - 2007 | |
| Spongoclonium caribaeum | Spain / Canary Islands | 1970 - 1979 | |
| Spratelloides delicatulus | Israel | 1973 | |
| Spyridia hypnoides | Israel | 1937 | |
| Stenothoe georgiana | Italy / Adriatic Sea | 2017 | |
| Stenothoe georgiana | Italy / Central Mediterranean | 2016 | |
| Stenothoe georgiana | Italy / Western Mediterranean | 2013 | |
| Stephanolepis diaspros | Greece / Central Mediterranean | 2016 | |
| Stephanolepis diaspros | Greece / Eastern Mediterranean | 1943 | |
| Stephanolepis diaspros | Israel | 1925 | |
