Barden, 2017: 2 (checklist).
Barden & Grimaldi, 2013: 407 (diagnosis of gyne); Perrichot, 2014: 166 (diagnosis of worker, review of genus); Cao et al., 2020: 163 (emended female diagnosis); Boudinot et al., 2020: 29; Zhuang et al., 2022: 1 (soft tissue); Chaul, 2023: 301 (revision), 305 (key to females), 307 (synopsis, species list, female diagnosis).
Fossil: 10 valid species