Phylogenetic tree based on 18S rDNA sequences using the Maximum Likelihood method.

<p>Representatives of the Pavlovophyceae were used as an out-group. Asterisks refer to the clade names of Edvardsen et al. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0081749#pone.0081749-Edvardsen1" target="_blank">[24]</a>. The numbers on each node indicate the bootstrap values from ML analysis and posterior probability of BI analysis. Solid circles indicate the clades supported by very high bootstrap values (100%) and posterior probability (1.00) by all analyses (ML, NJ, MP, and BI).