Diplasiotherium is an extinct genus of litoptern belonging to the family Proterotheriidae, that lived between the late Miocene and the early Pliocene (in the SALMAs Huayquerian and Montehermosan).Villafañé et al., 2006, p.161 The fossils of this animal have been found in Argentina, in the Monte Hermoso Formation.Rovereto, Cayetano. 1914. Los estratos Araucanos y sus fósiles. Anales del Museo Nacional de Historia Natural de Buenos Aires 25: 1–247.Deschamps & Tomassini, 2016, p.224
Diplasiotherium is distinguished from other proterotheriids by the crown of its molars, which were higher than in other related genera (protohypsodont), and by its larger body size; the species D. robustum reached approximately in weight, making it the largest known proterotheriid.Villafañe, A. L. (2005). Paleoecología de los Proterotheriidae (Mammalia, Litopterna): Un estudio basado en los cambios en la masa corporal. Tesis de Licenciatura (inédita), Facultad de Ciencias Naturales (sede Trelew), Universidad de la Patagonia San Juan Bosco, 145 págs.
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