Riftia is a monotypic genus of polychaete annelid worms in the Siboglinidae familiy, which contains the sole species Riftia pachyptila, commonly known as the giant tubeworm or giant beardworm.

Siboglinidae is a family of polychaete annelid worms whose members made up the former phyla Pogonophora and Vestimentifera. The family is composed of around 100 species of vermiform creatures which li