Annelida
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...ability to move properly, since functioning of the body muscles is dependent...openings are closed except when functioning, thus preventing the loss...mode of existence into two groups, the errantia and the sedentaria...Archiannelida and Myzostomaria Two groups of polychaetes that are sometimes...Myzostomaria. The former group includes a variety of minute...