A nearly complete specimen referred to "Epachthosaurus", UNPSJB-PV 920, was recovered during field research conducted as part of the project "Los vertebrados de la Formación Bajo Barreal, Provincia de Chubut, Patagonia, Argentina" by researchers from the Laboratorio de Paleontologia de Vertebrados of the Universidad Nacional de la Patagonia. The specimen, which is one of the most complete titanosaurian skeletons known, consists of a complete, well-preserved, and articulated skeleton only missing the skull, neck, four or five cranial dorsal vertebrae, and several distal caudals.