• †Formicium in Pseudosiricidae: Handlirsch, 1906: 577; Abe & Smith, 1991: 34 (in error).
• †Formicium in Formicidae: Cockerell, 1920: 279.
• †Formicium in Formicidae, †Formiciinae: Lutz, 1986: 181; Lutz, 1990: 61; Bolton, 1994: 187.
• †Formicium as junior synonym of †Pseudosirex: Handlirsch, 1906: 577 (in error).
• †Formicium as senior synonym of †Pseudosirex: Hölldobler & Wilson, 1990: 17 (in error).
• †Formicium as genus: Cockerell, 1920: 279; Lutz, 1986: 182; Lutz, 1990: 61, all subsequent authors.
• †Formicium as collective group name: Archibald et al., 2011: 3681.
• †Formicium as collective group name (parataxon) for species described from wings only: Katzke et al., 2018: 4.

Junior synonyms

• †Eoponera Carpenter, 1929
• †Megapterites Cockerell, 1920

Citations

• Abe, M.; Smith, D. R. 1991. The genus-group names of Symphyta (Hymenoptera) and their type species. Esakia 31:1-115. PDF
• Archibald, S. B.; Johnson, K. R.; Mathewes, R. W.; Greenwood, D. R. 2011. Intercontinental dispersal of giant thermophilic ants across the Arctic during early Eocene hyperthermals. Proceedings of the Royal Society. Series B, Biological Sciences 278:3679-3686. PDF
• Bolton, B. 1994. Identification guide to the ant genera of the world. Cambridge, Mass.: Harvard University Press, 222 pp.
• Cockerell, T. D. A. 1920. Fossil arthropods in the British Museum. - I. Annals and Magazine of Natural History (9)5:273-279.
• Handlirsch, A. 1906. Die fossilen Insekten und die Phylogenie der rezenten Formen. Ein Handbuch für Paläontologen und Zoologen. Lieferung 4. Leipzig: Wilhelm Engelmann, pp. 481-640.
• Hölldobler, B.; Wilson, E. O. 1990. The ants. Cambridge, Mass.: Harvard University Press, xii + 732 pp.
• Katzke, J.; Barden, P.; Dehon, M.; Michez, D.; Wappler, T. 2018. Giant ants and their shape: revealing relationships in the genus Titanomyrma with geometric morphometrics. PeerJ 6:e4242. 10.7717/peerj.4242 PDF
• Lutz, H. 1986. Eine neue Unterfamilie der Formicidae (Insecta: Hymenoptera) aus dem mittel-eozänen Olschiefer der "Grube Messel" bei Darmstadt (Deutschland, S-Hessen). Senckenbergiana Lethaea 67:177-218. PDF
• Lutz, H. 1990. Systematische und palökologische Untersuchungen an Insekten aus dem Mittel-Eozän der Grube Messel bei Darmstadt. Courier Forschungsinstitut Senckenberg 124:1-165.
• Westwood, J. O. 1854. Contributions to fossil entomology. Quarterly Journal of the Geological Society of London 10:378-396. PDF