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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2007-9-24
pubmed:databankReference
pubmed:abstractText
We combine a morphological description with a multigene analysis to assess the phylogenetic placement of a poorly known amoeboid taxon Corallomyxa within the eukaryotic tree of life. A detailed morphological analysis including transmission electron microscopy and light microscopy of Corallomyxa sp. ATCC 50975 demonstrates that this isolate is a new species, herein designated, Corallomyxa tenera sp. nov. This species possesses features of the genus, such as a multinucleate, reticulate plasmodium with localized bidirectional streaming and occasional formation of surface buds, but is differentially characterized from other species by its delicate appearance, short duration of the anastomosing reticulate network and production of round smooth-walled cysts. The new species also lacks some features found in some Corallomyxa species, including cytoplasmic condensation and an electron dense "chromocenter". A Bayesian analysis of four concatenated genes (SSU-rDNA, actin, alpha- and beta-tubulin) from a wide diversity of eukaryotes places the new species together with taxa placed in the putative supergroup 'Rhizaria'. All molecular loci refute the traditional placement of Corallomyxa within the supergroup 'Amoebozoa', which includes other Mycetozoidea and Lobosea. Maximum likelihood and Bayesian analyses of the two well-sampled genes, SSU-rDNA and actin, with increased taxon sampling of 'Rhizaria' show a close affinity of Corallomyxa with Foraminifera, Gromia and, for SSU-rDNA, Haplosporidia. We further identify a novel stem, herein designated E23-13-1, in the predicted SSU-rDNA secondary structure that supports this relationship. A hypothesis is presented for the evolution of morphological and molecular synapomorphies in a clade containing Gromia, Corallomyxa, Foraminifera and Haplosporidia.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1434-4610
pubmed:author
pubmed:issnType
Print
pubmed:volume
158
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
457-72
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
A multigene analysis of Corallomyxa tenera sp. nov. suggests its membership in a clade that includes Gromia, Haplosporidia and Foraminifera.
pubmed:affiliation
Department of Biological Sciences, Smith College, Northampton, MA 01063, USA. ytekle@email.smith.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.