• [First available use of Monomorium salomonis junodi opacior Forel, 1913a; unavailable (infrasubspecific) name (Bolton, 1987: 352).]
• [Misspelled as opacius by Wheeler, 1922: 871; Ettershank, 1966: 91.]
• Arnold, 1916: 220 (q.)
• As unavailable (infrasubspecific) name: Santschi, 1919b: 235; Emery, 1922c: 178; Wheeler, 1922: 871; Arnold, 1926: 231; Santschi, 1930b: 70; Santschi, 1936a: 39; Ettershank, 1966: 91.
• Subspecies of Monomorium salomonis: Arnold, 1916: 220; Stitz, 1923: 156.
• Subspecies of Monomorium subopacum: Arnold, 1944: 14
• Status as species: Bolton, 1995b: 265.
• Senior synonym of Monomorium opacior Bolton, 1987: Bolton, 1995b: 265.
• Senior synonym of Monomorium subopacum serenum: unpublished emendation (as both Monomorium opacior and Monomorium subopacum serenum syntypes examined by Bolton, 1987: 352, and judged synonymous).

Junior synonyms

• Monomorium opacior Bolton, 1987
• Monomorium subopacum serenum Arnold, 1944

Obsolete combinations

• Monomorium salomonis opacior

Citations

• Arnold, G. 1916. A monograph of the Formicidae of South Africa. Part II. Ponerinae, Dorylinae. Annals of the South African Museum 14:159-270. PDF
• Arnold, G. 1926. A monograph of the Formicidae of South Africa. Appendix. Annals of the South African Museum 23:191-295. PDF
• Arnold, G. 1944. New species of African Hymenoptera. No. 5. Occasional Papers of the National Museum of Southern Rhodesia 2:1-38. PDF
• Bolton, B. 1987. A review of the Solenopsis genus-group and revision of Afrotropical Monomorium Mayr (Hymenoptera: Formicidae). Bulletin of the British Museum (Natural History). Entomology 54:263-452. PDF
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Emery, C. 1922c. Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [part]. Genera Insectorum 174B:95-206. PDF
• Ettershank, G. 1966. A generic revision of the world Myrmicinae related to Solenopsis and Pheidologeton (Hymenoptera: Formicidae). Australian Journal of Zoology 14:73-171. PDF
• Forel, A. 1913k. Ameisen aus Rhodesia, Kapland usw. (Hym.) gesammelt von Herrn G. Arnold, Dr. H. Brauns und Anderen. Deutsche Entomologische Zeitschrift 1913(Suppl.):203-225. PDF
• Santschi, F. 1919b. Fourmis nouvelles éthiopiennes. Revue Zoologique Africaine (Brussels) 6:229-240. PDF
• Santschi, F. 1930b. Résultats de la Mission scientifique suisse en Angola, 1928-1929. Formicides de l'Angola. Revue Suisse de Zoologie 37:53-81. PDF
• Santschi, F. 1936a. Étude sur les fourmis du genre Monomorium Mayr. Bulletin de la Société des Sciences Naturelles du Maroc 16:32-64. PDF
• Stitz, H. 1923. Hymenoptera, VII. Formicidae. Beiträge zur Kenntnis der Land- und Süsswasserfauna Deutsch-Südwestafrikas 2:143-167.
• Wheeler, W. M. 1922. Ants of the American Museum Congo expedition. New York: Bulletin of the American Museum of Natural History, 1139.