Giant tube worm
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Giant tube worms (Riftia pachyptila) are marine invertebrates in the phylum Pogonophora (formerly grouped in phylum Annelida) related to tubeworms commonly found in the intertidal and pelagic zones. These giants live over a mile deep on the floor of the Pacific Ocean near hydrothermal vents and can tolerate extremely high temperatures and sulfur levels.
See also: Pompeii worm