Wheeler, 1922: 783; Bolton, 1995b: 75; Schmidt & Shattuck, 2014: 72 (species checklist); Fisher & Bolton, 2016: 205 (checklist).
Dlussky & Fedoseeva, 1988: 78 (synoptic classification); Bolton, 1995a: 1048 (census); Bolton & Fisher, 2008a: 54, 57 (diagnosis, all species revision, key); Hawkes, 2010: 28 (all species key); Schmidt & Shattuck, 2014: 70 (diagnosis, synopsis); Fisher & Bolton, 2016: 204 (diagnosis).
Extant: 3 valid species (2 synonyms)