Articulating "archiannelids": Phylogenomics and annelid relationships, with emphasis on meiofaunal taxa

TitleArticulating "archiannelids": Phylogenomics and annelid relationships, with emphasis on meiofaunal taxa
Publication TypeJournal Article
Year of Publication2015
AuthorsAndrade S.CS, Novo M., Kawauchi G.Y, Worsaae K., Pleijel F, Giribet G., Rouse GW
JournalMolecular Biology and Evolution
Volume32
Pagination2860-2875
Date Published2015/11
Type of ArticleArticle
ISBN Number0737-4038
Accession NumberWOS:000363033100005
Keywords28s rdna; aciculata; data; Errantia; evolution; genome; Meiofauna; morphological data; morphological diversification; myzostomida; phylogenetic position; phylogeny; polychaete; rna; Sedentaria; sequence; supermatrix; systematic position
Abstract

Annelid disparity has resulted in morphological-based classifications that disagree with phylogenies based on Sanger sequencing and phylogenomic analyses. However, the data used for the latter studies came from various sources and technologies, involved poorly occupied matrices and lacked key lineages. Here, we generated a new Illumina-based data set to address annelid relationships from a fresh perspective, independent from previously generated data and with nearly fully occupied matrices. Our sampling reflects the span of annelid diversity, including two symbiotic annelid groups (Myzostomida and Spinther) and five meiofaunal groups once referred to as part of Archiannelida (three from Protodrilida, plus Dinophilus and Polygordius). As well as the placement of these unusual annelids, we sought to address the overall phylogeny of Annelida, and provide a new perspective for naming of major clades. Our results largely corroborate the phylogenomic results of Weigert et al. (2014; Illuminating the base of the annelid tree using transcriptomics. Mol Biol Evol. 31: 1391-1401), with "Magelona + Owenia" and Chaetopteridae forming a grade with respect to all other annelids. Echiura and Sipuncula are supported as being annelid groups, with Sipuncula closest to amphinomids as sister group to Sedentaria and Errantia. We recovered the three Protodrilida terminals as sister clade to Phyllodocida and Eunicida (=clade Aciculata). We therefore place Protodrilida as part of Errantia. Polygordius was found to be sister group to the scaleworm terminal and the possibility that it is a simplified scaleworm clade, as has been shown for the former family Pisionidae, is discussed. Our results were equivocal with respect to Dinophilus, Myzostomida, and Spinther possibly owing to confounding long-branch effects.

DOI10.1093/molbev/msv157
Short TitleMol. Biol. Evol.
Student Publication: 
No