Fig. 4 in What Morphology and Molecules Tell Us about the Evolution of Oligotrichea (Alveolata, Ciliophora)

Fig. 4. Evolution of kinetid structures in the somatic ciliature of choreotrichid ciliates. The aloricate taxa have only one kinetid type, except for Leegaardiella elbraechteri and Lynnella. Tintinnids with ventral organelles have two (Tintinnidium, subgenus Tintinnidium), rarely one (Tintinnopsis cylindrata, Membranicola) or three (Tintinnidium, subgenus Semitintinnidium) kinetid types. Extant tintinnids with a ventral kinety have some dikinetids with two cilia and many monokinetids or some dikinetids with two cilia, some dikinetids with one cilium, and many monokinetids.