Smith, 1951c: 779 (North America); Kempf, 1972b: 164; Smith, 1979: 1329 (North America); Brandão, 1991: 360; Bolton, 1995b: 292; Borowiec, 2016: 191 (species checklist).
Borgmeier, 1955: 135 (diagnosis, all species revision, key); Watkins, 1976: 7 (all species key); Watkins, 1977a: 207 (all species key); Watkins, 1982: 215 (Mexico species key); Bolton, 1995a: 1051 (census); Palacio, 1999: 161 (Colombia species key); Brady et al., 2014: 4 (phylogeny); Baccaro et al., 2015: 164 (genus in Brazil); Borowiec, 2016: 185 (worker, male diagnoses); Cantone, 2017: 138 (brief male diagnosis); Palacio, 2019: 626 (Colombia species key).
Extant: 2 valid species (5 synonyms), 0 valid subspecies (9 synonyms)