• †Orapia in †Armaniinae: Dlussky et al., 2004: 2; Barden & Engel, 2019: 131 (implied).
• †Orapia in new subfamily?: Archibald et al., 2006: 511.
• †Orapia in †Sphecomyrminae, †Sphecomyrmini: Borysenko, 2017: 15, 17.
• †Orapia as genus: all authors.

Citations

• Archibald, S. B.; Cover, S. P.; Moreau, C. S. 2006. Bulldog ants of the Eocene Okanagan Highlands and history of the subfamily (Hymenoptera: Formicidae: Myrmeciinae). Annals of the Entomological Society of America 99:487-523. PDF
• Barden, P.; Engel, M. S. 2019. Fossil Social Insects. Cham: Springer Nature, 1-21. [online early] 10.1007/978-3-319-90306-4_45-1 PDF
• Borysenko, L. H. 2017. Description of a new genus of primitive ants from Canadian amber, with the study of relationships between stem- and crown-group ants (Hymenoptera: Formicidae). Insecta Mundi 570:1-57. PDF
• Dlussky, G. M.; Brothers, D. J.; Rasnitsyn, A. P. 2004. The first Late Cretaceous ants (Hymenoptera: Formicidae) from southern Africa, with comments on the origin of the Myrmicinae. Insect Systematics and Evolution 35:1-13. PDF