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A mitogenomic phylogeny of chitons (Mollusca: Polyplacophora)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology. CSIC, Museo Nacl Ciencias Nat, Dept Biodivers & Evolutionary Biol, C Jose Gutierrez Abascal 2, E-28006 Madrid, Spain.ORCID iD: 0000-0002-3628-1137
CSIC, Museo Nacl Ciencias Nat, Dept Biodivers & Evolutionary Biol, C Jose Gutierrez Abascal 2, E-28006 Madrid, Spain;Natl Museum Nat Hist, Smithsonian Inst, Dept Invertebrate Zool, 10th St & Constitut Ave NW, Washington, DC 20560 USA.
Calif State Univ Fullerton, Dept Biol Sci, 800 N State Coll Blvd, Fullerton, CA 92831 USA.
CSIC, Museo Nacl Ciencias Nat, Dept Biodivers & Evolutionary Biol, C Jose Gutierrez Abascal 2, E-28006 Madrid, Spain.
2020 (English)In: BMC Evolutionary Biology, ISSN 1471-2148, E-ISSN 1471-2148, Vol. 20, no 1, article id 22Article in journal (Refereed) Published
Abstract [en]

Background

Polyplacophora, or chitons, have long fascinated malacologists for their distinct and rather conserved morphology and lifestyle compared to other mollusk classes. However, key aspects of their phylogeny and evolution remain unclear due to the few morphological, molecular, or combined phylogenetic analyses, particularly those addressing the relationships among the major chiton lineages.

Results

Here, we present a mitogenomic phylogeny of chitons based on 13 newly sequenced mitochondrial genomes along with eight available ones and RNAseq-derived mitochondrial sequences from four additional species. Reconstructed phylogenies largely agreed with the latest advances in chiton systematics and integrative taxonomy but we identified some conflicts that call for taxonomic revisions. Despite an overall conserved gene order in chiton mitogenomes, we described three new rearrangements that might have taxonomic utility and reconstructed the most likely scenario of gene order change in this group. Our phylogeny was time-calibrated using various fossils and relaxed molecular clocks, and the robustness of these analyses was assessed with several sensitivity analyses. The inferred ages largely agreed with previous molecular clock estimates and the fossil record, but we also noted that the ambiguities inherent to the chiton fossil record might confound molecular clock analyses.

Conclusions

In light of the reconstructed time-calibrated framework, we discuss the evolution of key morphological features and call for a continued effort towards clarifying the phylogeny and evolution of chitons.

Place, publisher, year, edition, pages
2020. Vol. 20, no 1, article id 22
Keywords [en]
Bayesian, Evolution, Fossil, Maximum likelihood, Mitochondrial genome, Molecular clock, Mollusk, Mt, Timetree
National Category
Evolutionary Biology Biological Systematics
Identifiers
URN: urn:nbn:se:uu:diva-407432DOI: 10.1186/s12862-019-1573-2ISI: 000513520900001PubMedID: 32024460OAI: oai:DiVA.org:uu-407432DiVA, id: diva2:1417109
Funder
European Social Fund (ESF)Available from: 2020-03-26 Created: 2020-03-26 Last updated: 2020-03-26Bibliographically approved

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Irisarri, Iker

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4344454647484946 of 459
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