Molecular Phylogenetics of Gastropod Molluscs
Summary
Molecular phylogenetics has transformed our understanding of gastropod evolution by harnessing mitochondrial and nuclear markers alongside genome-scale data sets. Early single-gene studies often produced conflicting branching patterns, but the adoption of multi-locus and phylogenomic approaches has substantially reduced systematic errors arising from compositional bias, rate heterogeneity and incomplete lineage sampling. Analyses of mitochondrial gene order have provided independent characters, revealing lineage-specific rearrangements that mark rapid radiations in caenogastropods and heterobranchs. Transcriptome-based studies now integrate hundreds of loci under maximum likelihood, Bayesian and coalescent frameworks, yielding well-supported topologies and prompting the redefinition of traditional assemblages such as Pulmonata and Opisthobranchia. Molecular clocks calibrated with fossil constraints date the origin of major gastropod clades to the early Palaeozoic and trace bursts of diversification through palaeoclimatic events. Integrative work combining morphological, developmental and molecular evidence is refining taxonomic boundaries, with direct implications for biodiversity assessment, conservation management and control of invasive molluscs. Continued expansion of taxon sampling and the deployment of emerging genomic technologies promise ever greater resolution of both deep and shallow branches in the gastropod tree of life.
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Molecular Phylogenetics of Gastropod Molluscs publication trend
The graph below shows the total number of articles in molecular phylogenetics of gastropod molluscs across all publications each year (not limited to Nature Index journals).
Technical terms
Phylogenetics: the study of evolutionary relationships among organisms using molecular or morphological data.
Phylogenomics: the inference of phylogenetic relationships based on genome-scale sequence data.
Multi-locus analysis: a phylogenetic approach that combines sequences from several independent genes or markers.
Mitochondrial genome (mitogenome): the circular DNA molecule in mitochondria, often used for inferring evolutionary histories.
Molecular clock: a method that estimates divergence times by assuming a roughly constant rate of molecular change over time.
Monophyly: a group consisting of an ancestor and all its descendants, forming a single branch on the tree of life.
References
- Evolution of gastropod mitochondrial genome arrangements. BMC Ecology and Evolution (2008).
- On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia. BMC Ecology and Evolution (2010).
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