a molecular phylogeny of bivalve mollusks ancient radiations and divergences as revealed by mitochondrial genes双壳类软体动物分子系统学的古老的辐射和差异所揭示的线粒体基因.pdfVIP
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a molecular phylogeny of bivalve mollusks ancient radiations and divergences as revealed by mitochondrial genes双壳类软体动物分子系统学的古老的辐射和差异所揭示的线粒体基因
A Molecular Phylogeny of Bivalve Mollusks: Ancient
Radiations and Divergences as Revealed by
Mitochondrial Genes
1 2 2 1
Federico Plazzi *, Alessandro Ceregato , Marco Taviani , Marco Passamonti
1 Department of Biologia Evoluzionistica Sperimentale, University of Bologna, Bologna, Italy, 2 Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Bologna, Italy
Abstract
Background: Bivalves are very ancient and successful conchiferan mollusks (both in terms of species number and
geographical distribution). Despite their importance in marine biota, their deep phylogenetic relationships were scarcely
investigated from a molecular perspective, whereas much valuable work has been done on taxonomy, as well as phylogeny,
of lower taxa.
Methodology/Principal Findings: Here we present a class-level bivalve phylogeny with a broad sample of 122 ingroup taxa,
using four mitochondrial markers (MT-RNR1, MT-RNR2, MT-CO1, MT-CYB). Rigorous techniques have been exploited to set up
the dataset, analyze phylogenetic signal, and infer a single final tree. In this study, we show the basal position of
Opponobranchia to all Autobranchia, as well as of Palaeoheterodonta to the remaining Autobranchia, which we here
propose to call Amarsipobranchia. Anomalodesmata were retrieved as monophyletic and basal to (Heterodonta +
Pteriomorphia).
Conclusions/Significance: Bivalve morphological characters were traced onto the phylogenetic trees obtained from the
molecular analysis; our analysis suggests that eulamellibranch gills and heterodont hinge are ancestral characters for all
Autobranchia. This conclusion would entail a re
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