tube worms in hydrothermal vents deep sea exploration 2025, giant tube worm or riftia pachyptila arctic hydrothermal vent

vestimentifera invertebrate hydrothermal pogonophora pachyptila intertidal beardworm annelida1 undefined commonly annelida grouped pelagic riftia arctic marine phylum seabed worms vents giant found zones ocean tube worm vent deep sea