Figure 7 in The search finds an end: the morphologically chimeric hysterocinetids belong to the subclass Hymenostomatia (Ciliophora: Oligohymenophorea)

Figure 7. Phylogenetic tree based on the 18S rRNA gene, showing the phylogenetic position of hysterocinetids within the class Oligohymenophorea. The class Colpodea was used as an outgroup, following Zhang and Vďačný (2022). Although hysterocinetids are morphologically highly dissimilar from Tetrahymena, they are nested within its 'paravorax' clade with strong statistical support (100% ML bootstrap, 1.00 posterior probability). The 'paravorax' clade thus became paraphyletic and its name-bearing species T. paravorax is depicted as a sister-taxon of both hysterocinetids with full support. Posterior probabilities for Bayesian inference conducted in MrBayes and bootstrap values for maximum likelihood conducted in IQ-Tree were mapped onto the 50%-majority rule Bayesian consensus tree. Fully statistically supported nodes are marked with red solid circles. The scale bar denotes eight substitutions per 100 nucleotide positions.