Epithelantha spinosior C. Schmoll in Anales Inst. Biol. Univ. Nac. México 22: 11. 1951 sec. Aquino & al. 2019
- =Mammillaria micromeris var. unguispina Boed. in Monatsschr. Deutsch. Kakteen-Ges. 4: 118. 1932 syn. sec. ???
- =Epithelantha micromeris var. unguispina (Boed.) Backeb. in Cactus (Paris) 39: 31. 1954 syn. sec. ???
- =Epithelantha micromeris subsp. unguispina (Boed.) N.P. Taylor in Cactaceae Consensus Init. 5: 12. 1998 syn. sec. ???
- =Epithelantha unguispina (Boed.) D. Donati & Zanov. in Piante Grasse 30: 186. 2010 syn. sec. ???
- =Epithelantha unguispina subsp. huastecana D. Donati & Zanov. in Piante Grasse 30: 186. 2010 syn. sec. ???