ves·ti·men·tif·er·an 
(vĕs′tə-mĕn-tĭfər-ən)
(vĕs′tə-mĕn-tĭfər-ən)n.
Any of various often large marine annelid tubeworms of the family Siboglinidae that inhabit deep-sea hydrothermal vents and lack a digestive system, depending on endosymbiotic bacteria for nutrition. Vestimentiferans were formerly classified in the phylum Vestimentifera.
[From New Latin Vestīmentifera, former phylum name : Latin vestīmentum, outer garment; see VESTMENT + Latin -fera, neuter pl. of -fer, -fer.]