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Foraminifera and Cercozoa share a common origin according to RNA polymerase II phylogenies

¹ Dept of zoology and animal biology, University of Geneva, Sciences III, 30 Quai Ernest Ansermet, CH 1211 Genève 4, Switzerland
² Canadian Institute for Advanced Research, Department of Botany, University of British Columbia, #3529-6270 University Blvd, Vancouver, British Columbia, Canada V6T 1Z4

Correspondence
Jan Pawlowski
jan.pawlowski{at}zoo.unige.ch

Phylogenetic analysis of small and large subunits of rDNA genes suggested that Foraminifera originated early in the evolution of eukaryotes, preceding the origin of other rhizopodial protists. This view was recently challenged by the analysis of actin and ubiquitin protein sequences, which revealed a close relationship between Foraminifera and Cercozoa, an assemblage of various filose amoebae and amoeboflagellates that branch in the so-called crown of the SSU rDNA tree of eukaryotes. To further test this hypothesis, we sequenced a fragment of the largest subunit of the RNA polymerase II (RPB1) from five foraminiferans, two cercozoans and the testate filosean Gromia oviformis. Analysis of our data confirms a close relationship between Foraminifera and Cercozoa and points to Gromia as the closest relative of Foraminifera.

This paper was presented at the XIVth meeting of the International Society for Evolutionary Protistology in Vancouver, Canada, 19–24 June 2002.

Published online ahead of print on 5 September 2003 as DOI 10.1099/ijs.0.02597-0.

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