Fill in the Blanks The giant tubeworms found in the hydrothermal vents are called lack both a gut and a mouth. Instead, they have an organ called a (types of elements, e.g. potassium, sulfur, nitrogen, etc). (genus name) pachyptila worms. They that is packed full of crystals of Fill in the Blanks The tubeworms filter and provide both for (gas) and (gas) in the water through their skin and plume, -oxidizing bacteria to produce energy. Bacteria living inside of the tubeworms produce energy via process.