Epithelantha pachyrhiza (W.T. Marshall) Backeb. in Cactus (Paris) 39: 31. 1954 sec. Aquino & al. 2019
- =Epithelantha micromeris var. pachyrhiza W.T. Marshall in Cact. Succ. J. (Los Angeles) 16: 161. 1944 syn. sec. ???
- =Epithelantha pachyrhiza var. elongata Backeb. in Cactus (Paris) 39: 32. 1954 syn. sec. ???
- =Epithelantha micromeris subsp. pachyrhiza (W.T. Marshall) N.P. Taylor in Cactaceae Consensus Init. 5: 13. 1998 syn. sec. ???
- =Epithelantha pachyrhiza subsp. elongata (Backeb.) D. Donati & Zanov. in Piante Grasse 30: 185. 2010 syn. sec. ???
- =Epithelantha pachyrhiza subsp. parvula D. Donati & Zanov. in Piante Grasse 30: 185. 2010 syn. sec. ???