Trichodina
Protozoa | Ciliophora | Oligohymenophorea | Mobilida | Trichodinidae | Trichodina
Petriola
Biota | Animalia | Mollusca | Gastropoda | Heterobranchia | Euthyneura | Tectipleura | Eupulmonata | Stylommatophora | Achatinina | Achatinoidea | Achatinidae | Petriolinae | Petriola
|  |  | Cuvier, 1795 | Burmeister, 1837 |  |  | Haszprunar & Huber, 1990 | A. Schmidt, 1855 |  | Swainson, 1840 | Swainson, 1840 | Schileyko, 1999 | Dall, 1905