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This paper presents the results of a study of the systematics and larval developpment of Archiannelids collected from the littoral zone of the Yellow Sea.Five speties belonging to 3 families and 4 genera are identified.Of these,two are new species and two are recorded for the first time from Chinese waters.The Archiannelida are probably an artificial group uniting the Annelids of primitive structure.Most of them are meiobenthos.The Archiannelida form a heterogeneous group of annelids and should be considered as different families of polychaeta.