• Combination in †Gerontoformica: Barden & Grimaldi, 2016: 518 (or Suppl. Information p. 16)
• †Gerontoformica occidentalis in †Gerontoformica orientalis species group: Boudinot et al., 2020: 29
• †Gerontoformica occidentalis in †Gerontoformica cretacica species group: Boudinot et al., 2022: 1362

Obsolete combinations

• †Sphecomyrmodes occidentalis

Citations

• Barden, P.; Grimaldi, D. A. 2016. Adaptive radiation in socially advanced stem-group ants from the Cretaceous. Current Biology 26:515-521. 10.1016/j.cub.2015.12.060 PDF
• Boudinot, B. E.; Perrichot, V.; Chaul, J. C. M. 2020. †Camelosphecia gen. nov., lost ant-wasp intermediates from the mid-Cretaceous (Hymenoptera, Formicoidea). ZooKeys 1005:21-55. 10.3897/zookeys.1005.57629 PDF
• Boudinot, B. E.; Richter, A.; Katzke, J.; Chaul, J. C. M.; Keller, R. A.; Economo, E. P.; Beutel, R. G.; Yamamoto, S. 2022. Evidence for the evolution of eusociality in stem ants and a systematic revision of †Gerontoformica (Hymenoptera: Formicidae). Zoological Journal of the Linnean Society 195:1355-1389. 10.1093/zoolinnean/zlab097/6523228 PDF
• Perrichot, V.; Nel, A.; Néraudeau, D.; Lacau, S.; Guyot, T. 2008. New fossil ants in French Cretaceous amber (Hymenoptera: Formicidae). Naturwissenschaften 95:91-97. PDF