Figure 4 in The search finds an end: the morphologically chimeric hysterocinetids belong to the subclass Hymenostomatia (Ciliophora: Oligohymenophorea)

Figure 4. Hysterocineta bellerophon in vivo. A, D, less-side overviews, showing the variability of body shape and size, as well as of the nuclear apparatus. B, detail of the anterior body region, showing the dense somatic ciliature and the unciliated sucker. C, detail of the vacuolized oral area. E, detail of the posterior body region, showing the oral ciliature and the vacuolized cytoplasm. CV, contractile vacuole; FV, food vacuoles; IF, infundibulum; MA, macronucleus; OC, oral cilia; S, sucker; SC, somatic cilia. Scale bars = 20 µm (E), 30 µm (B), 50 µm (A), 100 µm (D).