Molecular data from the 16S rRNA gene for the phylogeny of Pectinidae (Mollusca: Bivalvia).

The phylogenetic relationships among the species belonging to the family Pectinidae are still an issue of debate. The mitochondrial DNA sequences from the large ribosomal RNA gene may be of great value for systematic and phylogenetic studies within families. Partial sequences of the 16S rRNA gene were obtained for the scallop species Adamussium colbecki, Aequipecten opercularis, Chlamys glabra, C. islandica, C. varia, and Pecten jacobeus and compared with the published sequence of Pecten maximus. The present molecular data show that Chlamys are polyphyletic and do not support the assignment of these species to the two subfamilies Chlamydinae and Pectininae. Moreover, the minimal genetic distance between P. maximus and P. jacobeus suggests that they could belong to the same species.