Molecular Phylogenetics and Systematics of Bivalve Mollusks

Molecular phylogenetics and systematics have transformed our understanding of bivalve evolution, replacing reliance on shell morphology with DNA-based inference of relationships. By comparing nucleotide sequences from mitochondrial and nuclear genes, researchers reconstruct phylogenetic trees that reveal deep divergences among the major lineages—Palaeoheterodonta, Pteriomorphia and Heterodonta—and clarify the origins of key anatomical innovations such as gill structure and shell microarchitecture. Multilocus and phylogenomic approaches harness hundreds to thousands of loci, greatly improving resolution at critical nodes and resolving ancient radiations. These molecular frameworks underpin a revised classification that recognises monophyletic groups and identifies paraphyletic taxa in need of taxonomic revision. Beyond pure systematics, molecular insights inform conservation priorities for endangered species, guide selective breeding programmes in aquaculture and illuminate patterns of biogeographical dispersal. By integrating sequence data with fossil calibrations, researchers can also estimate divergence times and explore correlations with palaeoenvironmental change. The global significance of molecular systematics extends to ecosystem management, invasive-species control and biomineralisation studies, making this discipline central to both fundamental biology and practical applications in marine resource stewardship.

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Molecular Phylogenetics and Systematics of Bivalve Mollusks publication trend

The graph below shows the total number of articles in molecular phylogenetics and systematics of bivalve mollusks across all publications each year (not limited to Nature Index journals).

Technical terms

Mitochondrial COI gene: A mitochondrial-encoded marker commonly used for species discrimination and phylogeography.

16S rRNA: A mitochondrial ribosomal RNA gene employed in phylogenetic analysis at genus and family levels.

Internal transcribed spacer 2 (ITS2): A nuclear ribosomal spacer region valued for its high variability and barcode utility in closely related taxa.

Multilocus analysis: An approach that combines data from multiple genetic loci to infer robust phylogenies and species delimitations.

Monophyletic group (clade): A set of organisms sharing a common ancestor not shared with other taxa; essential for natural classification.

Sequence-structure model: An alignment strategy that incorporates RNA secondary structure to improve accuracy in ribosomal gene analyses.

References

1. Molecular identification of intertidal rock oyster species in north-eastern Australia reveals new candidates for aquaculture. Aquaculture (2024).
2. Genetic Variability in Mediterranean Coastal Ecosystems: Insights into Ostrea spp. (Bivalvia: Ostreidae). Biology (2024).
3. Molecular Phylogenetics and Systematics of the Bivalve Family Ostreidae Based on rRNA Sequence-Structure Models and Multilocus Species Tree. PLOS ONE (2014).