ACOELOMORPH FLATWORMS ARE DEUTEROSTOMES RELATED TO XENOTURBELLA PDF

Acoels are the simplest ones; they have a mouth, but lack a gut, so that the food ingested goes directly to the internal tissues. Phylogenetic position of Acoelomorpha and Xenoturbellida according to Philippe et al. Tweedt 6 Estimated Fltaworms I am putting together a mailing list of interested people and I was wondering if you or any of your colleagues would be interested. From This Paper Figures, tables, and topics from this paper. By continuing to use this website, you agree to their use. Acoelomorph flatworms are deuterostomes related to Xenoturbella.

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Acoelomorph flatworms are deuterostomes related to Xenoturbella. Xenoturbellida and Acoelomorpha are marine worms with contentious ancestry. Both were originally associated with the flatworms Platyhelminthes , but molecular data have revised their phylogenetic positions, generally linking Xenoturbellida to the deuterostomes and positioning the Acoelomorpha as the most basally branching bilaterian group s.

Recent phylogenomic data suggested that Xenoturbellida and Acoelomorpha are sister taxa and together constitute an early branch of Bilateria. Here we assemble three independent data sets-mitochondrial genes, a phylogenomic data set of 38, amino-acid positions and new microRNA miRNA complements-and show that the position of Acoelomorpha is strongly affected by a long-branch attraction LBA artefact.

When we minimize LBA we find consistent support for a position of both acoelomorphs and Xenoturbella within the deuterostomes. The most likely phylogeny links Xenoturbella and Acoelomorpha in a clade we call Xenacoelomorpha. The Xenacoelomorpha is the sister group of the Ambulacraria hemichordates and echinoderms.

We show that analyses of miRNA complements have been affected by character loss in the acoels and that both groups possess one miRNA and the gene Rsb66 otherwise specific to deuterostomes.

In addition, Xenoturbella shares one miRNA with the ambulacrarians, and two with the acoels. This phylogeny makes sense of the shared characteristics of Xenoturbellida and Acoelomorpha, such as ciliary ultrastructure and diffuse nervous system, and implies the loss of various deuterostome characters in the Xenacoelomorpha including coelomic cavities, through gut and gill slits.

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ACOELOMORPH FLATWORMS ARE DEUTEROSTOMES RELATED TO XENOTURBELLA PDF

Acoelomorph flatworms are deuterostomes related to Xenoturbella. Xenoturbellida and Acoelomorpha are marine worms with contentious ancestry. Both were originally associated with the flatworms Platyhelminthes , but molecular data have revised their phylogenetic positions, generally linking Xenoturbellida to the deuterostomes and positioning the Acoelomorpha as the most basally branching bilaterian group s. Recent phylogenomic data suggested that Xenoturbellida and Acoelomorpha are sister taxa and together constitute an early branch of Bilateria. Here we assemble three independent data sets-mitochondrial genes, a phylogenomic data set of 38, amino-acid positions and new microRNA miRNA complements-and show that the position of Acoelomorpha is strongly affected by a long-branch attraction LBA artefact.

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Acoelomorph flatworms are deuterostomes related to Xenoturbella.

Go to: Abstract Xenoturbellida and Acoelomorpha are marine worms with contentious ancestry. Both were originally associated with the flatworms Platyhelminthes , but molecular data haverevised their phylogenetic positions, generally linking Xenoturbellida to the deuterostomes 1 , 2 and positioning the Acoelomorpha as the most basally branching bilaterian group s 3 — 6. Recent phylogenomic data suggested that Xenoturbellida and Acoelomorpha are sister taxa and together constitute an early branch of Bilateria 7. Here we assemble three independent data sets—mitochondrial genes, a phylogenomic data set of 38, amino-acid positions and new microRNA miRNA complements—and show that the position of Acoelomorpha is strongly affected by a long-branch attraction LBA artefact.

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Editorial Summary

Phylogenetics Abstract Xenoturbellida and Acoelomorpha are marine worms with contentious ancestry. Both were originally associated with the flatworms Platyhelminthes , but molecular data have revised their phylogenetic positions, generally linking Xenoturbellida to the deuterostomes 1 , 2 and positioning the Acoelomorpha as the most basally branching bilaterian group s 3 , 4 , 5 , 6. Recent phylogenomic data suggested that Xenoturbellida and Acoelomorpha are sister taxa and together constitute an early branch of Bilateria 7. Here we assemble three independent data sets—mitochondrial genes, a phylogenomic data set of 38, amino-acid positions and new microRNA miRNA complements—and show that the position of Acoelomorpha is strongly affected by a long-branch attraction LBA artefact.

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Acoelomorpha

Various members of the Acoela class. The subphylum Acoelomorpha is divided into two classes. Acoela comprise small flattened worms, classified into a dozen of families. If they are the sister group to Bilateria, it would point to a simple body plan for the first bilaterian. Alternatively, if acoelomorphs are related to deuterostomes, this would imply that their organisation is the result of secondary simplification. Xenoturbellida is the sister group to acoelomorphs, constituting the so-called Xenacoelomorpha clade.

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