• Snelling, 1966: 38 (w.q.)
• Combination in Cephalotes: Emery, 1924f: 304.
• Combination in Eucryptocerus: Kempf, 1959a: 92.
• Combination in Cephalotes: De Andrade & Baroni Urbani, 1999: 156.
• Status as species: Smith, 1862d: 411; Mayr, 1863a: 406; Roger, 1863b: 38; Dalla Torre, 1893: 144; Forel, 1895b: 134; Emery, 1924f: 304; Borgmeier, 1927c: 115; Kempf, 1951: 127; Kempf, 1959a: 92 (redescription); Kempf, 1960e: 396; Kempf, 1963c: 437; Kempf, 1972b: 107; Brandão, 1991: 343; Bolton, 1995b: 189; De Andrade & Baroni Urbani, 1999: 156 (redescription); Bezděčková et al., 2015: 116; Sandoval-Gómez & Sánchez-Restrepo, 2019: 913; Oliveira et al., 2021: 19 (in list).
• Senior synonym of Cephalotes fenestralis: Kempf, 1963c: 437; Kempf, 1972b: 107; Bolton, 1995b: 189; De Andrade & Baroni Urbani, 1999: 156; Oliveira et al., 2021: 19 (in list).

Junior synonyms

• Cephalotes fenestralis (Smith, 1876)
  Obsolete combination(s): Cryptocerus fenestralis

Obsolete combinations

• Cryptocerus placidus

Citations

• Bezděčková, K.; Bezděčka, P.; Machar, I. 2015. A checklist of the ants of Peru. Zootaxa 4020:101-133. PDF
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Borgmeier, T. 1927c. Catalogo systematico e synonymico das formigas do Brasil. 2 parte. Subf. Pseudomyrminae, Myrmicinae, Formicidae. Archivos do Museu Nacional (Rio de Janeiro) 29:69-164. PDF
• Brandão, C. R. F. 1991. Adendos ao catálogo abreviado das formigas da região Neotropical (Hymenoptera: Formicidae). Revista Brasileira de Entomologia 35:319-412. PDF
• Dalla Torre, K. W. 1893. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. Vol. 7. Formicidae (Heterogyna). Leipzig: W. Engelmann, 289 pp. PDF
• De Andrade, M. L.; Baroni Urbani, C. 1999. Diversity and adaptation in the ant genus Cephalotes, past and present. Stuttgarter Beiträge zur Naturkunde. Serie B (Geologie und Paläontologie) 271:1-889. PDF
• Emery, C. 1924f ("1922"). Hymenoptera. Fam. Formicidae. Subfam. Myrmicinae. [concl.]. Genera Insectorum 174C:207-397. PDF
• Forel, A. 1895b. A fauna das formigas do Brazil. Boletim do Museu Paraense de Historia Natural e Ethnographia 1:89-139. PDF
• Kempf, W. W. 1951. A taxonomic study on the ant tribe Cephalotini (Hymenoptera: Formicidae). Revista de Entomologia (Rio de Janeiro) 22:1-244. PDF
• Kempf, W. W. 1959a. Sôbre algumas formigas Cephalotini do Museu de Oxford (Hymenoptera, Formicidae). Revista Brasileira de Biologia 19:91-98. PDF
• Kempf, W. W. 1960e. Insecta Amapaensia. - Hymenoptera: Formicidae (segunda contribuição). Studia Entomologica (n.s.)3:385-400.
• Kempf, W. W. 1963c. Nota sinonímica acêrca de formigas da tribo Cephalotini (Hymenoptera, Formicidae). Revista Brasileira de Biologia 23:435-438. PDF
• Kempf, W. W. 1972b. Catálogo abreviado das formigas da região Neotropical. Studia Entomologica 15:3-344. PDF
• Mayr, G. 1863a. Formicidarum index synonymicus. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 13:385-460. PDF
• Oliveira, A. M.; Powell, S.; Feitosa, R. M. 2021. A taxonomic study of the Brazilian turtle ants (Formicidae: Myrmicinae: Cephalotes). Revista Brasileira de Entomologia 65 (3):52 pp. e20210028. [online early] 10.1590/1806-9665-RBENT-2021-0028 PDF
• Roger, J. 1863b. Verzeichniss der Formiciden-Gattungen und Arten. Berliner Entomologische Zeitschrift 7(Beilage):1-65. PDF
• Sandoval-Gómez, V. E.; Sánchez-Restrepo, A. F. 2019. Género Cephalotes. Capítulo 29. Pp. 899-915 in: Fernández, F.; Guerrero, R. J.; Delsinne, T. (eds.) 2019d. Hormigas de Colombia. Bogotá: Universidad Nacional de Colombia, 1198 pp. PDF
• Smith, F. 1860c. Descriptions of new genera and species of exotic Hymenoptera. Journal of Entomology 1:65-84. PDF
• Smith, F. 1862d. A list of the genera and species belonging to the family Cryptoceridae, with descriptions of new species; also a list of the species of the genus Echinopla. Transactions of the Entomological Society of London (3)1:407-416. PDF
• Snelling, R. R. 1966. The female of Eucryptocerus placidus (F. Smith) (Hymenoptera: Formicidae). Bulletin of the Southern California Academy of Sciences 65:37-40. PDF