Wheeler, 1922: 917; Emery, 1924f: 317; Bolton, 1995b: 258; Fisher & Bolton, 2016: 323 (checklist).
Arnold, 1917: 383 (diagnosis); Emery, 1924f: 317 (diagnosis); Bolton, 1973a: 344 (diagnosis); Bolton, 1983: 401 (diagnosis, all species revision, key); Bolton, 1994: 105 (synoptic classification); Bolton, 1995a: 1050 (census); Bolton, 1999: 1675 (morphology, diagnosis, review of genus, phylogeny); Bolton, 2000: 26 (diagnosis, all species revision, key); Fisher & Bolton, 2016: 321 (diagnosis).
Extant: 4 valid species
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