give the classification of phylum annelida up to subclass
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Most authors accept the annelids as having three major classes: Polychaeta, Oligochaeta, and Hirudinea. ... The class Polychaeta has also been divided into subclasses or orders, the Errantiata (free-moving forms) and Sedentaria (sedentary, or tube-dwelling, forms), based on the mode of living.
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