†Liometopum greenwalti LaPolla, 2023: 388, figs. 2, 6 (aq.) U.S.A. (Montana, Canyon Ferry Reservoir, Oligocene).

Primary type information: Primary type material: holotype queen. Primary type locality: U.S.A.: Montana, Canyon Ferry Reservoir; Lower Oligocene (Rupelian, ca. 32.0 ± 0.1 Ma). Primary type depository: MOR. Primary type specimen: MOR-IV-1465. Secondary type information: Secondary type material: 3 paratype queens. Secondary type locality: same as for holotype. Secondary type depository: MOR. Secondary type specimens: MOR-IV-1047, MOR-IV-1107, MOR-IV-1156. Type notes: The age range of 32 ± 0.1 Ma is probably best regarded as the uncertainty of an upper bound, not as the total deposit age range. This date is derived from uranium-lead dating of a tuff located 188 meters below the insect horizon, and as such the fossiliferous layer may be considerably younger, for example of Arikareean age (29.5-18.5 Ma) based on possible association with nearby vertebrate fossils (CoBabe, Chamberlain, Ivie & Giersch 2002. Rocky Mountain Geology 37(1): 13-30).