Bolton, 1995b: 392; Barden, 2017: 2 (checklist).
Wilson et al., 1967: 12 (phylogeny); Wilson, 1987b: 49 (review of genus); Grimaldi et al., 1997: 9 (review of genus); Engel & Grimaldi, 2005: 7 (diagnosis, all species key); Borysenko, 2017: 15; Boudinot et al., 2020: 31 (diagnosis in key).
Fossil: 3 valid species
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