Ritterocactus arnostianus (Lisal & Kolarik) Doweld in Sukkulenty 2(2): 22. 1999 Ritterocactus arnostianus (Lisal & Kolarik) Doweld in Sukkulenty 2(2): 22. 1999is new combination for Notocactus arnostianus Lisal & Kolarik in Internoto 7(1): 8. 1986Taxon for this nameRitterocactus arnostianus (Lisal & Kolarik) Doweld