Concatenated analysis sheds light on early metazoan evolution and fuels a modern "urmetazoon" hypothesis.
Cast your vote
You can rate an item by clicking the amount of stars they wish to award to this item.
When enough users have cast their vote on this item, the average rating will also be shown.
Your vote was cast
Thank you for your feedback
Thank you for your feedback
Dellaporta, Stephen L
Journal titlePLoS biology
Publication Begin pagee20
MetadataShow full item record
AbstractFor more than a century, the origin of metazoan animals has been debated. One aspect of this debate has been centered on what the hypothetical "urmetazoon" bauplan might have been. The morphologically most simply organized metazoan animal, the placozoan Trichoplax adhaerens, resembles an intriguing model for one of several "urmetazoon" hypotheses: the placula hypothesis. Clear support for a basal position of Placozoa would aid in resolving several key issues of metazoan-specific inventions (including, for example, head-foot axis, symmetry, and coelom) and would determine a root for unraveling their evolution. Unfortunately, the phylogenetic relationships at the base of Metazoa have been controversial because of conflicting phylogenetic scenarios generated while addressing the question. Here, we analyze the sum of morphological evidence, the secondary structure of mitochondrial ribosomal genes, and molecular sequence data from mitochondrial and nuclear genes that amass over 9,400 phylogenetically informative characters from 24 to 73 taxa. Together with mitochondrial DNA genome structure and sequence analyses and Hox-like gene expression patterns, these data (1) provide evidence that Placozoa are basal relative to all other diploblast phyla and (2) spark a modernized "urmetazoon" hypothesis.
CitationSchierwater B, Eitel M, Jakob W, Osigus HJ, Hadrys H, Dellaporta SL, Kolokotronis SO, Desalle R. Concatenated analysis sheds light on early metazoan evolution and fuels a modern "urmetazoon" hypothesis. PLoS Biol. 2009 Jan 27;7(1):e20. doi: 10.1371/journal.pbio.1000020. PMID: 19175291; PMCID: PMC2631068.
The following license files are associated with this item:
- Creative Commons
- Placozoa and the evolution of Metazoa and intrasomatic cell differentiation.
- Authors: Schierwater B, de Jong D, Desalle R
- Issue date: 2009 Feb
- Global diversity of the Placozoa.
- Authors: Eitel M, Osigus HJ, DeSalle R, Schierwater B
- Issue date: 2013
- Mitogenomics at the base of Metazoa.
- Authors: Osigus HJ, Eitel M, Bernt M, Donath A, Schierwater B
- Issue date: 2013 Nov
- The enigmatic Placozoa part 1: Exploring evolutionary controversies and poor ecological knowledge.
- Authors: Schierwater B, Osigus HJ, Bergmann T, Blackstone NW, Hadrys H, Hauslage J, Humbert PO, Kamm K, Kvansakul M, Wysocki K, DeSalle R
- Issue date: 2021 Oct
- Polyplacotoma mediterranea is a new ramified placozoan species.
- Authors: Osigus HJ, Rolfes S, Herzog R, Kamm K, Schierwater B
- Issue date: 2019 Mar 4