• Hagensia in Ponerinae, Ponerini: Emery, 1911e: 69 [subtribe Pachycondylini]; all subsequent authors.
• Hagensia as subgenus of Megaponera: Forel, 1901k: 333; Wheeler, 1910a: 135; Emery, 1911e: 61.
• Hagensia as subgenus of Euponera: Forel, 1917: 237.
• Hagensia as genus: Arnold, 1926: 202; Donisthorpe, 1943g: 648; Wheeler & Wheeler, 1985b: 256; Dlussky & Fedoseeva, 1988: 78; Hölldobler & Wilson, 1990: 11.
• Hagensia as junior synonym of Pachycondyla: Brown, 1994: 164; Bolton, 2003: 167.
• Hagensia revived from synonymy: Schmidt & Shattuck, 2014: 89

Citations

• Arnold, G. 1926. A monograph of the Formicidae of South Africa. Appendix. Annals of the South African Museum 23:191-295. PDF
• Bolton, B. 2003. Synopsis and classification of Formicidae. Memoirs of the American Entomological Institute 71:1-370. PDF
• Brown, W. L., Jr. 1994. [Untitled. Taxonomic changes in Pachycondyla, Emeryopone and Ponera attributed to Brown.]. P. 164 in: Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp.
• Cantone, S. 2017. Winged ants – The male. Dichotomous key to genera of winged male ants in the world. Behavioral ecology of mating flight. São Paulo: Autopubblicato, 318 pp. PDF
• Dlussky, G. M.; Fedoseeva, E. B. 1988. Origin and early stages of evolution in ants. [In Russian.]. Pp. 70-144 in: Ponomarenko, A. G. (ed.) 1988. Cretaceous biocenotic crisis and insect evolution. [In Russian.]. Moskva: Nauka, 232 pp.
• Donisthorpe, H. 1943g. A list of the type-species of the genera and subgenera of the Formicidae. [part]. Annals and Magazine of Natural History (11)10:617-688.
• Emery, C. 1911e. Hymenoptera. Fam. Formicidae. Subfam. Ponerinae. Genera Insectorum 118:1-125. PDF
• Forel, A. 1901k. Nouvelles espèces de Ponerinae. (Avec un nouveau sous-genre et une espèce nouvelle d'Eciton). Revue Suisse de Zoologie 9:325-353. PDF
• Forel, A. 1917. Cadre synoptique actuel de la faune universelle des fourmis. Bulletin de la Société Vaudoise des Sciences Naturelles 51:229-253. PDF
• Hölldobler, B.; Wilson, E. O. 1990. The ants. Cambridge, Mass.: Harvard University Press, xii + 732 pp.
• Schmidt, C. A.; Shattuck, S. O. 2014. The higher classification of the ant subfamily Ponerinae (Hymenoptera: Formicidae), with a review of ponerine ecology and behavior. Zootaxa 3817 (1):1-242. PDF
• Wheeler, G. C.; Wheeler, J. 1985b. A simplified conspectus of the Formicidae. Transactions of the American Entomological Society 111:255-264. PDF
• Wheeler, W. M. 1910a. Ants: their structure, development and behavior. New York: Columbia University Press, xxv + 663 pp. PDF