Nov 9, 2015

Exploring phylogenomic relationships within Myriapoda: should high matrix occupancy be the goal?

BioRxiv : the Preprint Server for Biology
Rosa FernandezGonzalo Giribet

Abstract

Myriapods are one of the dominant terrestrial arthropod groups including the diverse and familiar centipedes and millipedes. Although molecular evidence has shown that Myriapoda is monophyletic, its internal phylogeny remains contentious and understudied, especially when compared to those of Chelicerata and Hexapoda. Until now, efforts have focused on taxon sampling (e.g., by including a handful of genes in many species) or on maximizing matrix occupancy (e.g., by including hundreds or thousands of genes in just a few species), but a phylogeny maximizing sampling at both levels remains elusive. In this study, we analyzed forty Illumina transcriptomes representing three myriapod classes (Diplopoda, Chilopoda and Symphyla); twenty-five transcriptomes were newly sequenced to maximize representation at the ordinal level in Diplopoda and at the family level in Chilopoda. Eight supermatrices were constructed to explore the effect of several potential phylogenetic biases (e.g., rate of evolution, heterotachy) at three levels of mean gene occupancy per taxon (50%, 75% and 90%). Analyses based on maximum likelihood and Bayesian mixture models retrieved monophyly of each myriapod class, and resulted in two alternative phylogenetic positi...Continue Reading

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Mentioned in this Paper

Study
Genes
Diplopoda
Chilopoda
Science of Morphology
Scolopendromorpha
Extracellular Matrix
SPARC wt Allele
Subphylum Chelicerata
Subphylum Myriapoda

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