Since 1970's it has been also found in Mediterranean Sea, where it entered via the Suez Canal (Lessepsian migration).

[citation needed] R. nomadica can cause very painful injuries to humans, since it has vermicular filaments, which are covered in venomous stinging cells, in the mouth arms.

The R. nomadica had caused the largest numbers of envenomisations along the southern Levant coast.

The R. nomadica have caused a socioeconomic problem in Israel because of such outbreaks, during which they can release their venomous stinging cells.

[citation needed] Their presence can clog up seawater intake systems, such as those used by seawater-cooled power plants.