Click on the thumbnail below to veiw my taxonomic tree.
Riftia has four body regions: the plume, the vestimentum, the coelomic cavity, and the trophosome.
The plume serves to diffuse nutrients and waste in and out of the worm with the outside environment. The vestimentum helps to anchor the upper portion of the worm in the tube. It provides a safe passage for the blood heading from the plume to the trophosome. The vestimentum also generates new tube material, holds reproductive pores, and houses the heart and brain(8).The trophosome is a special organ which houses the symbiotic bacteria where the tubeworm gets its nutrients. The coelomic cavity allows for the development of organs. One more important structure is the opisthosome which has some segmentation. As far as I'm aware this is the only connection that links this guy to the phylum annelida; everything else seem to be debatable depending on what scientific camp you're in.
Riftia pachyptila is super cool because in essence it doesn't need
food and doesn't poo. What could make for a better pet?