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Mol. Biol. Evol. 20(11):1881-1886. 2003
DOI: 10.1093/molbev/msg201
© 2003 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038

Phylogeny of Lobose Amoebae Based on Actin and Small-Subunit Ribosomal RNA Genes

José F. Fahrni*,, Ignacio Bolivar*, Cédric Berney*, Elena Nassonova{dagger}, Alexey Smirnov{ddagger} and Jan Pawlowski*

* Department of Zoology and Animal Biology, University of Geneva, Geneva, Switzerland
{dagger} Laboratory of Cytology of Unicellular Organisms, Institute of Cytology RAS, St. Petersburg, Russia
{ddagger} Department of Invertebrate Zoology, St. Petersburg State University, St. Petersburg, Russia

E-mail: jose.fahrni{at}zoo.unige.ch.

Lobose amoebae are abundant free-living protists and important pathogenic agents, yet their evolutionary history and position in the universal tree of life are poorly known. Molecular data for lobose amoebae are limited to a few species, and all phylogenetic studies published so far lacked representatives of many of their taxonomic groups. Here we analyze actin and small-subunit ribosomal RNA (SSU rRNA) gene sequences of a broad taxon sampling of naked, lobose amoebae. Our results support the existence of a monophyletic Amoebozoa clade, which comprises all lobose amoebae examined so far, the amitochondriate pelobionts and entamoebids, and the slime molds. Both actin and SSU rRNA phylogenies distinguish two well-defined clades of amoebae, the "Gymnamoebia sensu stricto" and the Archamoebae (pelobionts + entamoebids), and one weakly supported and ill-resolved group comprising some naked, lobose amoebae and the Mycetozoa.

Key Words: actin • Amoebozoa • Lobosea • molecular phylogeny • small-subunit ribosomal RNA


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