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Caenogastropod mitogenomics.

David Osca1, José Templado1, Rafael Zardoya1

  • 1Museo Nacional de Ciencias Naturales (MNCN-CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain.

Molecular Phylogenetics and Evolution
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Summary
This summary is machine-generated.

This study sequenced mitochondrial genomes to resolve Caenogastropoda phylogeny. Findings clarify relationships, suggesting Tonnoidea belongs within Neogastropoda and questioning its traditional monophyly.

Keywords:
ArchitaenioglossaCaenogastropodaHypsogastropodaLittorinimorphaMitochondrial genomesNeogastropoda

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Area of Science:

  • Molluscan evolutionary biology
  • Phylogenomics
  • Mitochondrial genome evolution

Background:

  • Phylogenetic relationships within Caenogastropoda remain incompletely resolved.
  • Mitochondrial genomes offer valuable markers for resolving evolutionary histories.
  • Previous studies have yielded conflicting or unresolved placements for several superfamilies.

Purpose of the Study:

  • To elucidate the phylogenetic relationships within Caenogastropoda using complete mitochondrial genomes.
  • To investigate the evolutionary placement of superfamilies like Cyclophoroidea, Naticoidea, Tonnoidea, Buccinoidea, and Cypraeoidea.
  • To re-evaluate the monophyly of major caenogastropod clades, including Neogastropoda.

Main Methods:

  • Sequencing of complete and partial mitochondrial genomes from key caenogastropod species.
  • Phylogenetic reconstruction using probabilistic methods based on concatenated amino acid sequences of protein-coding genes.
  • Comparative analysis of gene order conservation across caenogastropod mitochondrial genomes.

Main Results:

  • Mitochondrial genome sequences confirmed conserved gene order in most caenogastropods, with exceptions noted in Cochlostoma hidalgoi.
  • Phylogenetic analyses recovered Architaenioglossa as a grade and supported the monophyly of Hypsogastropoda (excluding Vermetoidea).
  • Tonnoidea was placed within Neogastropoda, challenging its traditional classification and suggesting potential polyphyly of Muricoidea.

Conclusions:

  • The study provides a robust phylogenetic framework for Caenogastropoda based on mitochondrial genome data.
  • The findings necessitate a re-evaluation of higher-level taxonomic classifications within Caenogastropoda, particularly for Neogastropoda and Muricoidea.
  • Long-branch attraction artifacts were identified as a challenge in resolving the placement of taxa like Vermetoidea.