Emery, 1910b: 27; Wheeler, 1922: 750; Bolton, 1995b: 58; Borowiec, 2016: 77 (species checklist); Fisher & Bolton, 2016: 184 (checklist).
Emery, 1910b: 27 (diagnosis of male); Santschi, 1924b: 200 (all species key); Brown, 1975: 43 (diagnosis of male, review of genus); Baroni Urbani et al., 1992: 315 (phylogeny); Bolton, 1994: 14 (synopsis); Bolton, 2003: 37, 150 (diagnosis, synopsis); Brady & Ward, 2005: 593 (phylogeny); Brady et al., 2006: 18173 (phylogeny); Ward, 2007c: 555 (classification); Brady et al., 2014: 4 (phylogeny); Borowiec, 2016: 73 (worker diagnosis); Fisher & Bolton, 2016: 182 (worker diagnosis); Cantone, 2017: 120 (brief male diagnosis).
Extant: 7 valid species, 0 valid subspecies (1 obsolete combination)