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Two morphotypes of Polydora cf. ciliata Jonston, 1838 from the White Sea were studied. The first one is tubedwelling, inhabiting a silted substrate, while the second is a shell-boring and is associated with Littorina littorea (Linnaeus, 1758). The results obtained show the presence both of morphological and genetic differences between these morphotypes, which makes it possible to consider them as two different species.