• [First available use of Formica pratensis thyssei Stärcke, 1942c; unavailable (infrasubspecific) name.]
• Junior synonym of Formica nigricans: Yarrow, 1955a: 4.
• Junior synonym of Formica pratensis: Dlussky, 1967a: 84; Kutter, 1977c: 272; Seifert, 1992a: 225; Bolton, 1995b: 201; Radchenko, 2016: 291; Seifert, 2021: 160.

Citations

• Betrem, J. G. 1955b. De systematische plaats van Formica congerens ab. thijssei Stärcke (Hym., Form.). Entomologische Berichten (Amsterdam) 15:391-393. PDF
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Dlussky, G. M. 1967a. Ants of the genus Formica (Hymenoptera, Formicidae, g. Formica). [In Russian.]. Moskva: Nauka Publishing House, 236 pp. PDF
• Kutter, H. 1977c. Hymenoptera, Formicidae. Insecta Helvetica. Fauna 6:1-298. PDF
• Radchenko, A. G. 2016. Ants (Hymenoptera, Formicidae) of Ukraine. National Academy of Sciences of Ukraine. Kiev: I. I. Schmalhausen Institute of Zoology, 496 pp.
• Seifert, B. 1992a. Formica nigricans Emery, 1909 - an ecomorph of Formica pratensis Retzius, 1783 (Hymenoptera, Formicidae). Entomologica Fennica 2:217-226. PDF
• Seifert, B. 2021. A taxonomic revision of the Palaearctic members of the Formica rufa group (Hymenoptera: Formicidae) – the famous mound-building red wood ants. Myrmecological News 31:133-179. 10.25849/myrmecol.news_031:133 PDF
• Yarrow, I. H. H. 1955a. The British ants allied to Formica rufa L. (Hym., Formicidae). Transactions of the Society for British Entomology 12:1-48. PDF