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Hirudinea like Leeches, Trochophore Larva as do Mollusks, Polychaeta like Marine Worms, Annelids most have External setae, Body Segments may be Separated, Body Segments may be Fused, Oligochaeta like Earth Worms, Annelids have Coelom, Annelids have Organ Systems, Annelids have Trochophore Larva, Annelids have Body Segments, Annelids include Hirudinea, Annelids include Oligochaeta, Annelids include Polychaeta