Mammalia - Perissodactyla - Rhinocerotidae

Synonym: Procaenopus Figgins 1934

Parent taxon: Rhinocerotidae according to L. T. Holbrook 1999

Sister taxa: Aceratheriinae, Amphicaenopus, Atelodus, Brachydiceratherium, Chilotheridium, Diceratheriinae, Dicerorhininae, Didermocerus, Dromoceratherium, Elasmotheriina, Epiaceratherium, Gaindatherium, Gulfoceras, Huangotherium, Iranotheriinae, Iranotherium, Menoceratinae, Mesaceratherium, Meschotherium, Paradiceros, Penetrigonias, Pleuroceros, Proaceratherium, Protoaceratherium, Rhinocerotinae, Subhyracodon, Teleoceratinae, Teletaceras, Uintaceras, Zalabis

Subtaxa: Trigonias osborni, Trigonias wellsi, Trigonias yoderensis

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Type: Trigonias osborni

Ecology: ground dwelling browser