Abstract Polydorid species (Annelida, Spionidae), which inhabit the shells of commercially important oyster Crassostrea gigas , were investigated along coast Normandy, France. Eight species, including five new records for Normandy ( Polydora onagawaensis websteri Boccardia pseudonatrix proboscidea and Boccardiella hamata ) two first in European waters P. B. ), identified based on morphological,...