Taken from:

Lynn, D.H. and E.B. Small. 1997. A Revised Classification of the Phylum Ciliophora Doflein, 1901. Rev. Soc. Mex. Hist. Nat. 47: 65-78.

Fig. 1. A distance tree for the ciliates (Phylum Ciliophora) derived from evolutionary distances between SSrRNA gene sequences produced by the Jukes-Cantor correction model and constructed using the Fitch-Margoliash least squares (LS) method and neighbour-joining (NJ) method. The LS bootstrap percent for 500 resamplings is followed by the NJ bootstrap percent at the base of each clade. Bootstrap percents less than 50% are indicated by an asterisk (*). Evolutionary distance is represented by the horizontal comonent separating species in the figure. The scale bar corresponds to 5 changes per 100 positions. Names for suprageneric taxa appear in boldface. From Wright et al., 1997.