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Phylogeny and taxonomy of Xanthophyceae (Stramenopiles, Chromalveolata). | LitMetric

Phylogeny and taxonomy of Xanthophyceae (Stramenopiles, Chromalveolata).

Protist

Department of Biology, University of Padova, Via U. Bassi 58/B, 35131 Padova, Italy.

Published: August 2009

AI Article Synopsis

  • The Xanthophyceae class has been inconsistently classified into two to seven orders, with prior studies facing issues in taxon and gene sampling, leading to identified para-polyphyletic groups.
  • A comprehensive analysis of multiple gene portions (SSU rDNA, rbcL, and psaA) was conducted using various molecular methods, resulting in a clearer understanding of evolutionary relationships and new taxonomic revisions.
  • The study proposed ten official epitypes for certain genera, redefined some genera as monophyletic, confirmed four major clades, and excluded a particular species from Xanthophyceae, placing it in incertae sedis.

Article Abstract

The stramenopile class Xanthophyceae has been variously divided into two to seven orders. Previous molecular phylogenetic analyses of the class have had limited taxon/gene sampling or have focused on particular taxa. Despite these limitations para-polyphyletic groups have been identified at different taxonomic ranks. To investigate the phylogeny of the Xanthophyceae, a multiple alignment containing SSU rDNA, rbcL and psaA gene portions was analyzed according to bayesian inference, maximum likelihood, minimum evolution and maximum parsimony methods. This multigenic approach allowed robust resolution of evolutionary relationships within Xanthophyceae and the proposal of a taxonomic revision within the class. The best statistically supported tree either showed/or confirmed that several taxa at different taxonomic levels were para-polyphyletic. Ten epitypes were formally proposed for species of Chlorellidium, Botrydiopsis and Bumilleriopsis. Boundaries of these coccoid genera were redefined as monophyletic groups. Four major clades received strong statistical support. These accommodated most of the studied coccoid, filamentous and siphonous Xanthophyceae. Unicellular flagellates, amoeboid and palmelloid taxa were not included in the study. Botrydiopsis pyrenoidosa was excluded from Xanthophyceae and placed incertae sedis.

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Source
http://dx.doi.org/10.1016/j.protis.2009.02.002DOI Listing

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