Emery, 1910b: 23 (Eciton (Acamatus)); Smith, 1951c: 780 (North America); Kempf, 1972b: 152 (Neotropical); Smith, 1979: 1329 (North America); Brandão, 1991: 359 (Neotropical); Bolton, 1995b: 287; Borowiec, 2016: 176 (species checklist); Boudinot et al., 2024: 141 (fossil synopsis)
Emery, 1894d: 183 (species key); Emery, 1910b: 23 (Eciton (Acamatus) diagnosis); Gallardo, 1920: 348 (Argentina species key); Smith, 1942c: 542 (U.S.A. species key); Buren, 1944a: 280 (U.S.A., Iowa species key); Creighton, 1950a: 66 (Nearctic species key); Borgmeier, 1955: 277, 290 (diagnosis, all species revision, key); Watkins, 1971: 93 (U.S.A. species key); Watkins, 1972: 348 (U.S.A. species key); Watkins, 1976: 11 (all species key); Watkins, 1982: 210 (Mexico species key); Watkins, 1985: 481 (U.S.A. species key); Wheeler & Wheeler, 1986g: 19 (U.S.A., Nevada species key); Bolton, 1995a: 1051 (census); Ward, 1999a: 90 (modification of Watkins, 1985 key); Palacio, 1999: 154 (Colombia species key); Mackay & Mackay, 2002: 40 (U.S.A., New Mexico species key); Coovert, 2005: 30 (U.S.A., Ohio species key); Snelling & Snelling, 2007: 462 (U.S.A. species, keys); Brady et al., 2014: 4 (phylogeny); Baccaro et al., 2015: 162 (genus in Brazil); Borowiec, 2016: 170 (worker, male diagnosis); Cantone, 2017: 135 (brief male diagnosis); Palacio, 2019: 613 (Colombia species key).
Extant: 125 valid species (32 synonyms, 3 homonyms, 3 unidentifiable, 2 unavailable, 7 obsolete combinations, 1 unavailable misspelling), 1 valid subspecies (27 synonyms, 1 obsolete combination)
Fossil: 1 valid species