Divergence times in demosponges (Porifera): first insights from new mitogenomes and the inclusion of fossils in a birth-death clock model

BMC Evolutionary Biology
Astrid SchusterGert Wörheide

Abstract

Approximately 80% of all described extant sponge species belong to the class Demospongiae. Yet, despite their diversity and importance, accurate divergence times are still unknown for most demosponge clades. The estimation of demosponge divergence time is key to answering fundamental questions on the origin of Demospongiae, their diversification and historical biogeography. Molecular sequence data alone is not informative on an absolute time scale, and therefore needs to be "calibrated" with additional data such as fossils. Here, we calibrate the molecular data with the fossilized birth-death model, which compared to strict node dating, allows for the inclusion of young and old fossils in the analysis of divergence time. We use desma-bearing sponges, a diverse group of demosponges that form rigid skeletons and have a rich and continuous fossil record dating back to the Cambrian (~500 Ma), to date the demosponge radiation and constrain the timing of key evolutionary events, like the transition from marine to freshwater habitats. To infer a dated phylogeny of Demospongiae we assembled the mitochondrial genomes of six desma-bearing demosponges from reduced-representation genomic libraries. The total dataset included 33 complete de...Continue Reading

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Citations

Jul 29, 2019·Wiley Interdisciplinary Reviews. Developmental Biology·Jeffrey Colgren, Scott A Nichols
Feb 26, 2020·Nature Ecology & Evolution·Qing TangShuhai Xiao
Oct 17, 2018·Nature Ecology & Evolution·J Alex ZumbergeRoger E Summons
Jun 27, 2019·Molecular Biology and Evolution·Nathan J KennyValeria B Itskovich
Jul 28, 2019·Nature Communications·Qing TangShuhai Xiao

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Software Mentioned

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LogCombiner
End reAd mergeR ( PEAR )
TreeAnnotator
phylobayes
BLAST
Paired
BEAST
RAxML
ProtTest

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