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A MOLECULAR ANALYSIS OF THE EUGLENOPHYTES USING SSU RDNA.

Eric W Linton1, Maria Alejandra Nudelman1, Visitacion Conforti1

  • 1Rutgers University, Department of Cell Biology and Neuroscience, Nelson Biological Laboratories, 604 Allison Road, Piscataway, New Jersey 08854-8082Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Biológicas, Ciudad Universitaria, 1428 Buenos Aires, Argentina.

Journal of Phycology
|March 16, 2018
PubMed
Summary
This summary is machine-generated.

Phylogenetic analysis of Euglena and related genera using small subunit ribosomal DNA (SSU rDNA) reveals that current classifications are not monophyletic. This suggests a need for taxonomic revision in Euglenoid phylogeny.

Keywords:
AstasiaKhawkineaLepocinclisPhacusdistanceeuglenozoamaximum likelihoodparsimonyphylogenytaxonomy

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Area of Science:

  • Protistology
  • Molecular Systematics
  • Evolutionary Biology

Background:

  • The genus Euglena and related taxa have undergone numerous taxonomic revisions based on morphological characteristics.
  • Previous classifications created genera like Phacus, Lepocinclis, Astasia, and Khawkinea using intuitive methods.
  • The monophyly and validity of these established genera, particularly Euglena, have been questioned.

Purpose of the Study:

  • To assess the phylogenetic validity of genera within Euglenoidea, with a focus on the genus Euglena.
  • To establish a robust phylogenetic framework using molecular data to resolve taxonomic uncertainties.
  • To investigate the evolutionary relationships among phototrophic and phagotrophic euglenoids.

Main Methods:

  • Phylogenetic analysis was conducted using small subunit (SSU) ribosomal DNA (rDNA) sequence data.
  • Conserved sequence regions were utilized for phylogenetic reconstruction.
  • Parsimony, maximum likelihood, and distance methods were employed, consistently yielding trees with identical topologies.

Main Results:

  • The phylogenetic analysis revealed a distinct evolutionary pattern within the euglenoid clade, starting with phagotrophic forms, followed by phototrophs, and then osmotrophs.
  • Among photosynthetic euglenoids, biflagellate taxa were found to have diverged earlier than uniflagellate taxa.
  • Taxa from the genera Euglena, Phacus, and Lepocinclis were found to be intermixed and did not form monophyletic groups, indicating polyphyly.

Conclusions:

  • The current taxonomic classification of Euglena, Phacus, and Lepocinclis is not supported by molecular phylogenetic data.
  • The genera Astasia and Khawkinea are also integrated within the photosynthetic groups, further complicating the existing taxonomy.
  • A significant revision of the taxonomy for these euglenoid genera is necessary to reflect their evolutionary history accurately.