Mammalia - Perissodactyla - Hyracodontidae

Synonyms: Eotrigonias Wood 1927, Prothyracodon Scott and Osborn 1887

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

Sister taxa: Allacerops, Alloceropinae, Aprotodon, Benaratherium, Eggysodon, Guixia, Hyracodon, Hyracodontinae, Ilianodon, Imequincisoria, Pappaceras, Praeaceratherium, Rhodopagus, Symphysorrhachis, Triplopides, Triplopodinae, Urtinotherium

Subtaxa: Prothyracodon uintense, Triplopus cubitalis, Triplopus implicatus, Triplopus obliquidens, Triplopus rhinocerinus, Triplopus woodi

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Ecology: ground dwelling browser