uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
An expanded phylogeny of social amoebas (Dictyostelia) shows increasing diversity and new morphological patterns
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology.
Show others and affiliations
2011 (English)In: BMC Evolutionary Biology, ISSN 1471-2148, Vol. 11, 84- p.Article in journal (Refereed) Published
Abstract [en]

Background: Social Amoebae or Dictyostelia are eukaryotic microbes with a unique life cycle consisting of both uni- and multicellular stages. They have long fascinated molecular, developmental and evolutionary biologists, and Dictyostelium discoideum is now one of the most widely studied eukaryotic microbial models. The first molecular phylogeny of Dictyostelia included most of the species known at the time and suggested an extremely deep taxon with a molecular depth roughly equivalent to Metazoa. The group was also shown to consist of four major clades, none of which correspond to traditional genera. Potential morphological justification was identified for three of the four major groups, on the basis of which tentative names were assigned. Results: Over the past four years, the Mycetozoan Global Biodiversity Survey has identified many new isolates that appear to be new species of Dictyostelia, along with numerous isolates of previously described species. We have determined 18S ribosomal RNA gene sequences for all of these new isolates. Phylogenetic analyses of these data show at least 50 new species, and these arise from throughout the dictyostelid tree breaking up many previously isolated long branches. The resulting tree now shows eight well-supported major groups instead of the original four. The new species also expand the known morphological diversity of the previously established four major groups, violating nearly all previously suggested deep morphological patterns. Conclusions: A greatly expanded phylogeny of Dictyostelia now shows even greater morphological plasticity at deep taxonomic levels. In fact, there now seem to be no obvious deep evolutionary trends across the group. However at a finer level, patterns in morphological character evolution are beginning to emerge. These results also suggest that there is a far greater diversity of Dictyostelia yet to be discovered, including novel morphologies.

Place, publisher, year, edition, pages
2011. Vol. 11, 84- p.
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-152918DOI: 10.1186/1471-2148-11-84ISI: 000289416000001PubMedID: 21453486OAI: oai:DiVA.org:uu-152918DiVA: diva2:414425
Available from: 2011-05-03 Created: 2011-05-03 Last updated: 2011-05-03Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed
By organisation
Systematic Biology
In the same journal
BMC Evolutionary Biology
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 179 hits
ReferencesLink to record
Permanent link

Direct link