• Lectotype designation: Wilson, 2003a: 331.
• [First available use of Pheidole fallax arenicola obscurithorax Santschi, 1923d; unavailable (infrasubspecific) name.]
• As unavailable (infrasubspecific) name: Santschi, 1925e: 150; Borgmeier, 1927c: 81; Kempf, 1972b: 191.
• Subspecies of Pheidole fallax: Bolton, 1995b: 326.
• Status as species: Deyrup et al., 2000: 296; Deyrup, 2003: 46; Wilson, 2003a: 331 (redescription); MacGown & Forster, 2005: 71; Wild, 2007b: 35; Sarnat et al., 2015: 62 (redescription); Deyrup, 2017: 94; Guerrero et al., 2022: 325.

Obsolete combinations

• Pheidole fallax obscurithorax

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
• Deyrup, M. 2003. An updated list of Florida ants (Hymenoptera: Formicidae). Florida Entomologist 86:43-48. PDF
• Deyrup, M. 2017. Ants of Florida. Identification and natural history. Boca Raton, Florida: CRC Press (Taylor & Francis group), 423 pp.
• Deyrup, M.; Davis, L.; Cover, S. 2000. Exotic ants in Florida. Transactions of the American Entomological Society 126:293-326.
• Guerrero, R. J.; García, E.; Fernández, F. 2022. The Pheidole Westwood, 1839 ants (Formicidae: Myrmicinae) in Colombia: new records including two species with remarkable morphology. Zootaxa 5154 (3):319-332. 10.11646/zootaxa.5154.3.5 PDF
• Kempf, W. W. 1972b. Catálogo abreviado das formigas da região Neotropical. Studia Entomologica 15:3-344. PDF
• MacGown, J. A.; Forster, J. A. 2005. A preliminary list of the ants (Hymenoptera: Formicidae) of Alabama, U. S. A. Entomological News 116:61-74. PDF
• Naves, M. A. 1985. A monograph of the genus Pheidole in Florida, USA (Hymenoptera: Formicidae). Insecta Mundi 1:53-90. PDF
• Santschi, F. 1925e. Fourmis des provinces argentines de Santa Fe, Catamarca, Santa Cruz, Córdoba et Los Andes. Comunicaciones del Museo Nacional de Historia Natural "Bernardino Rivadavia" 2:149-168. PDF
• Sarnat, E. M.; Fischer, G.; Guénard, B.; Economo, E. P. 2015. Introduced Pheidole of the world: taxonomy, biology and distribution. ZooKeys 543:1-109. 10.3897/zookeys.543.6050 PDF
• Wild, A. L. 2007b. A catalogue of the ants of Paraguay (Hymenoptera: Formicidae). Zootaxa 1622:1-55. PDF
• Wilson, E. O. 2003a. Pheidole in the New World. A dominant, hyperdiverse ant genus. Cambridge, Mass.: Harvard University Press, [ix] + 794 pp.