• Lectotype designation: Wilson, 2003a: 765.
• [Misspelled as pachyderma by Santschi, 1912e: 529.]
• Subspecies of Pheidole risii: Santschi, 1912e: 529; Bruch, 1914: 221; Emery, 1922c: 103; Santschi, 1933f: 110; Kempf, 1972b: 200; Bolton, 1995b: 331.
• Status as species: Wilson, 2003a: 765 (redescription).

Obsolete combinations

• Pheidole risii trachyderma

Citations

• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Bruch, C. 1914. Catálogo sistemático de los formícidos argentinos. Revista del Museo de La Plata 19:211-234. PDF
• Emery, C. 1906c ("1905"). Studi sulle formiche della fauna Neotropica. XXXVII. Bullettino della Società Entomologica Italiana 37 (1905):107-194. PDF
• Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B:95-206. PDF
• Kempf, W. W. 1972b. Catálogo abreviado das formigas da região Neotropical. Studia Entomologica 15:3-344. PDF
• Santschi, F. 1912e. Quelques fourmis de l'Amérique australe. Revue Suisse de Zoologie 20:519-534. PDF
• Santschi, F. 1933f. Fourmis de la République Argentine en particulier du territoire de Misiones. Anales de la Sociedad Cientifica Argentina 116:105-124. PDF
• Wilson, E. O. 2003a. Pheidole in the New World. A dominant, hyperdiverse ant genus. Cambridge, Mass.: Harvard University Press, [ix] + 794 pp.