Molecular phylogenies of euglenids are usually based on ribosomal RNA genes that do not resolve the branching order among the deeper lineages. We addressed deep euglenid phylogeny using the cytosolic form of the heat-shock protein 90 gene (hsp90), which has already been employed with some success in other groups of euglenozoans and eukaryotes in general. Hsp90 sequences were generated from three taxa of euglenids representing different degrees of ultrastructural complexity, namely Petalomonas…
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