Figure 2

A distance tree for tetrahymenid ciliates inferred from small subunit ribosomal DNA sequences. The tree was derived from evolutionary distances produced by the Kimura-2-parameter correction model [35]. The numbers at the nodes represent the bootstrap percentages of 1,000 for the least squares method (LS [36]) followed by the bootstrap values for the neighbor joining method (NJ) of Saitou and Nei [37]. Evolutionary distance is represented by the branch length separating the species. The scale bar corresponds to 5 substitutions per 100 nucleotide positions.