Xenacoelomorpha is the sister group to Nephrozoa
@article{Cannon2016XenacoelomorphaIT, title={Xenacoelomorpha is the sister group to Nephrozoa}, author={Johanna Cannon and Bruno C. Vellutini and Julian Smith and Fredrik Ronquist and Ulf Jondelius and Andreas Hejnol}, journal={Nature}, year={2016}, volume={530}, pages={89-93} }
The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships. [] Key Result Here we show robust phylogenomic support for Xenacoelomorpha as the sister taxon of Nephrozoa. Our phylogenetic analyses, based on 11 novel xenacoelomorph transcriptomes and using different models of evolution under maximum likelihood and Bayesian inference analyses, strongly corroborate this result.
264 Citations
Molecular approaches for studying the evolution of the Xenacoelomorpha
- Biology
- 2017
Gen visualisation protocols are developed and applied to investigate the expression patterns of genes commonly associated with ultrafiltration in Xenoturbella and the acoel Symsagittifera roscoffensis to shed light on the origin and homology of filtratory structures, which remain unclear.
Xenacoelomorpha flatworms are basal Deuterostome
- Biology
- 2020
This work sequence Heterochaerus australis’s mitochondrial genome and infer intrinsic relationships of Metazoan with Xenacoelomorpha and finds the optimal tree under the popular maximum likelihood (ML) and Bayesian phylogenetic reconstructions are consensus with each other being strongly supported.
Xenacoelomorpha, a Key Group to Understand Bilaterian Evolution: Morphological and Molecular Perspectives
- BiologyEvolution, Origin of Life, Concepts and Methods
- 2019
What has been learned over the last decades on the morphology, genomics and phylogenetic relationships of the Xenacoelomorpha is revisited.
Computational analysis of gene content in Xenacoelomorpha
- Biology
- 2017
The phylogenetic analysis tentatively supports the placement of Xenacoelomorpha as a sister group of Ambulacraria, and the analysis of ancestral gene family content is suggestive for the phylogenetic position of the XenacoELOMorpha.
Xenacoelomorph-Specific Hox Peptides: Insights into the Phylogeny of Acoels, Nemertodermatids, and Xenoturbellids
- BiologyZoological Science
- 2019
Results from the decoded genome of the acoel Praesagittifera naikaiensis and reported xenacoelomorph Hox genes revealed that acoels share a peptide NLK(S/T)MSQ(V/I)D, which starts immediately after the homeodomain sequence of the central Hox4/5/6.
Hidden diversity of Acoelomorpha revealed through metabarcoding
- Biology, Environmental ScienceBiology Letters
- 2016
Analysis of 18S rDNA metabarcoding data from three marine projects covering benthic and pelagic habitats worldwide shows that acoels have a greater richness in planktonic environments than previously described, and identifies a putative novel clade in the deep benthos that branches as sister group to the rest of Acoela, thus representing the earliest-branching acoel clade.
Phylogeny: A home for Xenoturbella
- BiologyNature
- 2016
Four new deep-sea species of Xenoturbella are added from the eastern Pacific Ocean to the two already known from the Atlantic, and phylogenetic analysis aligns them at the base of the Protostomia or even as basal bilaterians.
Development of Xenoturbellida.
- BiologyResults and problems in cell differentiation
- 2019
Comparison with the other marine invertebrate larvae suggests that the morphologically simple swimming larvae described in Xenoturbella represent an ancestral larval type of all metazoans and bilaterians.
Filtering artifactual signal increases support for Xenacoelomorpha and Ambulacraria sister relationship in the animal tree of life
- BiologyCurrent Biology
- 2022
The slow evolving genome of the xenacoelomorph worm Xenoturbella bocki
- BiologybioRxiv
- 2022
The data do not provide evidence supporting the idea that Xenacoelomorpha are a primitively simple outgroup to other bilaterians and gene presence/absence data support a relationship with Ambulacraria, but it is concluded that X. bocki has a complex genome typical of bilateralians, in contrast to the apparent simplicity of its body plan.
References
SHOWING 1-10 OF 47 REFERENCES
Acoelomorph flatworms are deuterostomes related to Xenoturbella
- BiologyNature
- 2011
This phylogeny makes sense of the shared characteristics of Xenoturbellida and Acoelomorpha, and implies the loss of various deuterostome characters in the Xenobiology including coelomic cavities, through gut and gill slits.
The Nemertodermatida are basal bilaterians and not members of the Platyhelminthes
- Biology
- 2002
The results imply that the last common ancestor of bilaterian metazoans was a small, benthic, direct developer without segments, coelomic cavities, nephrida or a true brain.
Deuterostome phylogeny reveals monophyletic chordates and the new phylum Xenoturbellida
- BiologyNature
- 2006
To study the relationships among all deuterostome groups, an alignment of more than 35,000 homologous amino acids is assembled, including new data from a hemichordate, starfish and Xenoturbella and it is concluded that chordates are monophyletic.
The mitochondrial genome structure of Xenoturbella bocki (phylum Xenoturbellida) is ancestral within the deuterostomes
- BiologyBMC Evolutionary Biology
- 2008
The mitochondrial genome of Xenoturbella bocki has a very conserved gene arrangement in the deuterostome group, strikingly similar to that of the hemichordates and the chordates, and thus to the ancestral deuterstome gene order.
Assessing the root of bilaterian animals with scalable phylogenomic methods
- BiologyProceedings of the Royal Society B: Biological Sciences
- 2009
New sequence data and methods strongly uphold previous suggestions that Acoelomorpha is sister clade to all other bilaterian animals, find diminishing evidence for the placement of the enigmatic Xenoturbella within Deuterostomia, and place Cycliophora with Entoprocta and EctoproCTa.
On the phylogenetic position of Myzostomida: can 77 genes get it wrong?
- BiologyBMC Evolutionary Biology
- 2009
It is concluded that reliance of a set of markers belonging to a single class of macromolecular complexes might bias the analysis, and that concatenation of all available data might introduce conflicting signal into phylogenetic analyses.
Error, signal, and the placement of Ctenophora sister to all other animals
- BiologyProceedings of the National Academy of Sciences
- 2015
Investigating possible causes of systematic error by expanding taxon sampling with eight novel transcriptomes, strictly enforcing orthology inference criteria, and progressively examining potential causes of systemic error while using both maximum-likelihood with robust data partitioning and Bayesian inference with a site-heterogeneous model finds a single, statistically robust placement of ctenophores as the authors' most distant animal relatives.
New deep-sea species of Xenoturbella and the position of Xenacoelomorpha
- Biology, Environmental ScienceNature
- 2016
Four new Xenoturbella species from deep waters of the eastern Pacific Ocean are described and Phylogenomic analyses of transcriptomic sequences support placement of Xenacoelomorpha as sister to Nephrozoa or Protostomia.
Bilaterian phylogeny: a broad sampling of 13 nuclear genes provides a new Lophotrochozoa phylogeny and supports a paraphyletic basal acoelomorpha.
- BiologyMolecular biology and evolution
- 2009
A new phylogeny not only agrees with most classical molecular results but also provides new insights into the relationships between lophotrochozoans and challenges the results obtained using high-throughput strategies, highlighting the problems associated with the current trend to increase gene number rather than taxa.
How the worm got its pharynx: phylogeny, classification and Bayesian assessment of character evolution in Acoela.
- BiologySystematic biology
- 2011
A phylogenetic classification of Acoela down to the family level where six previous family level taxa are synonymized and Diopisthoporidae is the sister group to all other acoels and has the highest posterior similarity to the root.