Eubrachiosaurus is an extinct genus of stahleckeriine stahleckeriid dicynodont known from the Late Triassic (Norian stage) of Wyoming, United States. Eubrachiosaurus is known only from the holotype specimen FMNH UC 633, a partial left scapula as well as a left humerus, and left pelvis which have been lost. It was collected at the Little Popo Agie River, near Lander, Fremont County from the Popo Agie Formation of the Chugwater Group. Eubrachiosaurus browni was first described and named by Samuel Wendell Williston in 1904 along with Brachybrachium brevipes. Lucas and Hunt (1993) considered both taxa junior synonyms of Placerias hesternus, which is known from the same formation, a position maintained in most subsequent studies. The synonymy of Eubrachiosaurus and Placerias was questioned by L