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Citation for Study 923

About Citation title: "Phylogeny of Euglenophyceae based on SSU rDNA sequences: taxonomic implications.".
About This study was previously identified under the legacy study ID S800 (Status: Published).


Nudelman M., Rossi M., Conforti V., & Triemer R. 2003. Phylogeny of Euglenophyceae based on SSU rDNA sequences: taxonomic implications. Journal of Phycology, 39(1): 226-235.


  • Nudelman M.
  • Rossi M.
  • Conforti V.
  • Triemer R.


Small subunit rDNA sequences of 42 taxa belonging to 10 genera were used to infer phylogenetic relationships among euglenoids. Members of the phototrophic genera Euglena, Phacus, Lepocinclis, Colacium, Trachelomonas, and Strombomonas plus the osmotrophs Astasia longa, Khawkinea quartana, and Hyalophacus ocellatus were included. Six major clades were found in most trees using multiple methods. The utility of Bayesian analyses in resolving these clades is demonstrated. The genus Phacus was polyphyletic with taxa sorting into two main clades. The two clades correlated with overall morphology and corresponded in large part to the previously defined sections, Pleur- aspis Pochmann and Proterophacus Pochmann. Euglena was also polyphyletic and split into two clades. In Bayesian analyses species with less plastic pellicles and small disk-like chloroplasts diverged at the base of the tree. They grouped into a single clade which included the two Lepocinclis spp., which also are rigid and bear similar chloroplasts. The metabolic Euglena species with larger plastids bearing pyrenoids and paramylon caps arose near the top of the tree. The loricates Strombomonas and Trachelomonas formed two well- supported, but paraphyletic, clades. The strong support for the individual clades confirmed the value of using lorica features as taxonomic criteria. The separation of the osmotrophic species A. longa, K. quartana, and H. ocellatus into different clades suggested that the loss of the photosynthetic ability has occurred multiple times.


euglenoids; Euglenophyta; Euglenozoa; molecular phylogeny; SSU rDNA

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