Pelecyphora macromeris (Engelm.) D. Aquino & Dan. Sanchez comb. nov.

Mammillaria macromeris ≡ Mammillaria macromeris Engelm. Mem. Tour N. Mexico [Wislizenus] 97. 1848. Echinocactus macromeris (Engelm.) Poselg. Allg. Gartenzeitung 21: 102. 1853. Coryphantha macromeris (Engelm.) Lem., Cactées 35. 1868. Lepidocoryphantha macromeris (Engelm.) Backeb. Cactaceae (Berlin) 1941: 61. 1942. Type: United States, New México, sandy soil near Doñana [Dona Ana], 08 May 1846, A. Wislizenius s.n. (lectotype, designated by Benson, Cacti U. S. Canada: 959. 1982: MO [2017406 image!, 2017407 image!, two sheets]).

Mammillaria dactylothele = Mammillaria dactylothele Labour., Monogr. Cact.: 146. 1853. Type. Not designated.