Genus: Beesiiwo FITCH, HAAS, C’HAIR, RIDGLEY, RIDGLEY, OLDMAN, REYNOLDS & LOVELACE, 2023
Etymology: Arapho, beesiiwo, "big lizard."
= Hyperodapedontidae incertae sedis PARRISH, 1989
= Hyperodapedon sanjuanenesis LUCAS, HECKERT & HOTTON III, 2002

Species: cooowuse FITCH, HAAS, C’HAIR, RIDGLEY, RIDGLEY, OLDMAN, REYNOLDS & LOVELACE, 2023
Etymology: Arapho, co' oowu se, "Alcova area", central Wyoming.

Holotype: USNM 494329

Locality: Willow Creek, near Hole in the Wall, Southern Bighorn Mountains, SW ¼, SW1/4, SW1/4, sec. 10, T41N, R83W, Natrona County, Wyoming.

Horizon: Lower carbonate unit, Popo Agie Formation.

Biostratigraphy:

Age: Late Carnian Stage, Early Late Triassic Epoch, Early Late Triassic.

Material: Fragment of a left maxilla and a left dentary.

Referred material:

UWGM 7027: Fragment of a right maxilla.

UWGM 7028: Fragment of a right maxilla.

TxVP 46037: Fragment of left maxilla.