The Quoorian marshsucker was a species that was indigenous to the planet Quooria, which was located in the Expansion Region. It shared similarities with mosquitos, but possessed a significantly higher level of lethality.
A related species to the Quoorian marshsuckers ultimately faced extinction on Quooria and became trapped and protected within the sap of the planet's trees. At some point before 3637 BBY when an old disease reemerged, these preserved creatures potentially contained the solution to fighting it.
The Quoorian marshsucker was initially referenced in the BioWare video game, Star Wars: Knights of the Old Republic, which was released in 2003.