Mitigating Anticipated Effects of Systematic Errors Supports Sister-Group Relationship between Xenacoelomorpha and Ambulacraria.

Details

Serval ID
serval:BIB_43B8702FAD67
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Mitigating Anticipated Effects of Systematic Errors Supports Sister-Group Relationship between Xenacoelomorpha and Ambulacraria.
Journal
Current Biology
Author(s)
Philippe H., Poustka A.J., Chiodin M., Hoff K.J., Dessimoz C., Tomiczek B., Schiffer P.H., Müller S., Domman D., Horn M., Kuhl H., Timmermann B., Satoh N., Hikosaka-Katayama T., Nakano H., Rowe M.L., Elphick M.R., Thomas-Chollier M., Hankeln T., Mertes F., Wallberg A., Rast J.P., Copley R.R., Martinez P., Telford M.J.
ISSN
1879-0445 (Electronic)
ISSN-L
0960-9822
Publication state
Published
Issued date
03/06/2019
Peer-reviewed
Oui
Volume
29
Number
11
Pages
1818-1826.e6
Language
english
Abstract
Xenoturbella and the acoelomorph worms (Xenacoelomorpha) are simple marine animals with controversial affinities. They have been placed as the sister group of all other bilaterian animals (Nephrozoa hypothesis), implying their simplicity is an ancient characteristic [1, 2]; alternatively, they have been linked to the complex Ambulacraria (echinoderms and hemichordates) in a clade called the Xenambulacraria [3-5], suggesting their simplicity evolved by reduction from a complex ancestor. The difficulty resolving this problem implies the phylogenetic signal supporting the correct solution is weak and affected by inadequate modeling, creating a misleading non-phylogenetic signal. The idea that the Nephrozoa hypothesis might be an artifact is prompted by the faster molecular evolutionary rate observed within the Acoelomorpha. Unequal rates of evolution are known to result in the systematic artifact of long branch attraction, which would be predicted to result in an attraction between long-branch acoelomorphs and the outgroup, pulling them toward the root [6]. Other biases inadequately accommodated by the models used can also have strong effects, exacerbated in the context of short internal branches and long terminal branches [7]. We have assembled a large and informative dataset to address this problem. Analyses designed to reduce or to emphasize misleading signals show the Nephrozoa hypothesis is supported under conditions expected to exacerbate errors, and the Xenambulacraria hypothesis is preferred in conditions designed to reduce errors. Our reanalyses of two other recently published datasets [1, 2] produce the same result. We conclude that the Xenacoelomorpha are simplified relatives of the Ambulacraria.
Keywords
Acoelomorpha, Ambulacraria, Metazoa, Nephrozoa, Xenoturbella, phylogenomics, phylogeny, systematic error
Pubmed
Web of science
Open Access
Yes
Create date
25/05/2019 12:06
Last modification date
20/08/2019 14:47
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