title: Molecular phylogeny of the family Pectinidae (Mollusca: Bivalvia) based on mitochondrial 16S and 12S rRNA genes.
abstract: Pectinidae is a large bivalve family characterised by almost circular, flat shells. Species are distributed worldwide and fall into three life-styles: swimming, byssally attached to hard substrates, and cemented to rocks with one valve. Despite these very different life strategies, pectinid shells are highly conservative in shape and offer few clues for the unravelling of phylogenetic issues. Consequently, phylogenetic studies based on morphological features have not yielded conclusive results. We thus set out to analyse partial sequences of mitochondrial 12S and 16S rRNA genes from 23 species of 16 genera with molecular techniques. The results are largely in contrast, both at the genus and the subfamily level, with the systematic classifications based on adult morphological characters, whereas they agree with the morphological classifications based on the more conserved non-adaptive features.
authors.affiliation: Istituto di Biologia e Genetica, Facoltà di Scienze, Università Politecnica delle Marche, via Brecce Bianche, I-60131 Ancona, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Barucca
authors.forename: Ettore
authors.initials: E
authors.lastname: Olmo
authors.forename: Stefano
authors.initials: S
authors.lastname: Schiaparelli
authors.forename: Adriana
authors.initials: A
authors.lastname: Canapa
mesh_terms: D000818:Animals; D004272:DNA, Mitochondrial; D019143:Evolution, Molecular; D016013:Likelihood Functions; D008974:Mollusca / Q000235:genetics / Q000502:physiology*; D010802:Phylogeny; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S
chemical_list: D004272:DNA, Mitochondrial; D012335:RNA, Ribosomal; D012336:RNA, Ribosomal, 16S; C075526:RNA, ribosomal, 12S