• Junior synonym of Pheidole megacephala: Dalla Torre, 1892: 90; Emery, 1892c: 160; Dalla Torre, 1893: 92, 194 (footnote); Emery, 1915i: 235; Emery, 1921c: 85; Wheeler, 1922: 812; Bolton, 1995b: 320; Eguchi, 2001b: 77; Eguchi, 2008: 55; Fischer & Fisher, 2013: 332; Sarnat et al., 2015: 50.
• [Note: Pheidole edax is perhaps not a Pheidole species, but if the synonymy is correct then Pheidole edax would have priority over Pheidole megacephala; however, under Art. 23.9 of ICZN (1999) Pheidole edax is a nomen oblitum.]

Obsolete combinations

• Formica edax

Citations

• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Dalla Torre, K. W. 1892. Hymenopterologische Notizen. Wiener Entomologische Zeitung 11:89-93. PDF
• Dalla Torre, K. W. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. PDF
• Eguchi, K. 2001b. A revision of the Bornean species of the ant genus Pheidole (Insecta: Hymenoptera: Formicidae: Myrmicinae). Tropics Monograph Series 2:1-154. PDF
• Eguchi, K. 2008. A revision of northern Vietnamese species of the ant genus Pheidole (Insecta: Hymenoptera: Formicidae: Myrmicinae). Zootaxa 1902:1-118. PDF
• Emery, C. 1892c ("1891"). Note sinonimiche sulle formiche. Bullettino della Società Entomologica Italiana 23:159-167. PDF
• Emery, C. 1915i. Les Pheidole du groupe megacephala (Formicidae). Revue Zoologique Africaine (Brussels) 4:223-250. PDF
• Emery, C. 1921c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174A:1-94 + 7 plates. PDF
• Fischer, G.; Fisher, B. L. 2013. A revision of Pheidole Westwood (Hymenoptera: Formicidae) in the islands of the Southwest Indian Ocean and designation of a neotype for the invasive Pheidole megacephala. Zootaxa 3683:301-356. PDF
• Forskål, P. 1775. Descriptiones animalium, avium, amphibiorum, piscium, insectorum, vermium; quae in itinere orientali observavit Petrus Forskål. Post mortum auctoris edidit Carsten Niebuhr. Hauniae [= Copenhagen]: Moeller, xxxiv + 164 pp.
• Horn, W.; Kahle, I. 1935. Sammlungen, welche ihren Eigentümer gewechselt haben [Part 1]. Entomologische Beihefte aus Berlin-Dahlem 2:1-160.
• 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
• Wheeler, W. M. 1922. Ants of the American Museum Congo expedition. New York: Bulletin of the American Museum of Natural History, 1139.