Sedentaria
Sedentaria (bamboo worms, coneworms, fanworms, lugworms; phylum Annelida, class Polychaeta) A subclass of entirely marine worms in which the body segments and parapodia differ along the length of an individual. All Sedentaria are burrowers or tube-dwellers. They are first recorded from the Ordovician. There is no acceptable ordinal classification for the Polychaeta; the class is divided into Errantia and Sedentaria for convenience but genera belonging to each subclass may not be related.
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Sedentaria