Mammillaria formosa subsp. microthele (Muehlenpf.) D.R. Hunt, Mammillaria Postscripts 6: 9. 1997 sec. Hunt 2016
- ≡Mammillaria microthele Muehlenpf. in Allg. Gartenzeitung 16: 11. 1848 syn. sec. Guzmán & al. 2003
- =Mammillaria formosa var. microthele (Muehlenpf.) Salm-Dyck, Cact. hort. dyck., ed. 3: 87. 1850 syn. sec. Guzmán & al. 2003