• Lectotype designation: Wilson, 2003a: 706.
• Subspecies of Pheidole guilelmimuelleri: Forel, 1911e: 302; Forel, 1912g: 221; Emery, 1922c: 103; Santschi, 1923d: 56; Borgmeier, 1927c: 83; Kempf, 1972b: 194; Bolton, 1995b: 322.
• Status as species: Wilson, 2003a: 706 (redescription).
• Senior synonym of Pheidole guilelmimuelleri ultrix: Wilson, 2003a: 706.
• Material of the unavailable names Pheidole guilelmimuelleri heyeri dryas, Pheidole guilelmimuelleri heyeri infans, Pheidole guilelmimuelleri heyeri injuncta referred here by Wilson, 2003a: 706.

Junior synonyms

• Pheidole guilelmimuelleri ultrix Forel, 1912

Obsolete combinations

• Pheidole guilelmimuelleri heyeri

Citations

• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Borgmeier, T. 1927c. Catalogo systematico e synonymico das formigas do Brasil. 2 parte. Subf. Pseudomyrminae, Myrmicinae, Formicidae. Archivos do Museu Nacional (Rio de Janeiro) 29:69-164. PDF
• Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B:95-206. PDF
• Forel, A. 1899e. Formicidae. [part]. Biologia Centrali-Americana Hym. 3:57-80. PDF
• Forel, A. 1911e. Ameisen des Herrn Prof. v. Ihering aus Brasilien (Sao Paulo usw.) nebst einigen anderen aus Südamerika und Afrika (Hym.). Deutsche Entomologische Zeitschrift 1911:285-312. PDF
• Forel, A. 1912g. Formicides néotropiques. Part III. 3me sous-famille Myrmicinae (suite). Genres Cremastogaster et Pheidole. Mémoires de la Société Entomologique de Belgique 19:211-237. PDF
• Kempf, W. W. 1972b. Catálogo abreviado das formigas da região Neotropical. Studia Entomologica 15:3-344. PDF
• Santschi, F. 1923d. Pheidole et quelques autres fourmis néotropiques. Annales de la Société Entomologique de Belgique 63:45-69. PDF
• Wilson, E. O. 2003a. Pheidole in the New World. A dominant, hyperdiverse ant genus. Cambridge, Mass.: Harvard University Press, [ix] + 794 pp.