Echinomastus unguispinus (Engelm.) Britton & Rose subsp. unguispinus, Cactaceae (Britton & Rose) 3: 150. 1922 sec. Guzmán & al. 2003
- =Echinomastus mapimiensis Backeb. in Cact. Succ. J. Gr. Brit. 15: 68. 1953 syn. sec. Guzmán & al. 2003
- =Neolloydia unguispina (Engelm.) L.D. Benson in Cact. Succ. J. (Los Angeles) 46: 80. 1974 syn. sec. Guzmán & al. 2003
- =Thelocactus unguispinus (Engelm.) G.D. Rowley in Excelsa 12: 30. 1986 syn. sec. Guzmán & al. 2003
- =Pediocactus unguispinus (Engelm.) Halda in Acta Mus. Richnov., Sect. Nat., 5: 25. 1998 syn. sec. Guzmán & al. 2003