Taylor & Brown, 1985: 74; Taylor, 1987a: 53; Bolton, 1995b: 316.
Taylor, 1970b: 209 (review of genus); Bolton, 1995a: 1051 (census); Shattuck, 1999: 151 (synopsis); Shattuck, 2006: 50 (all species, key).
Extant: 3 valid species