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hyracotherian
hyracotherian adj. 
/ˌhaɪərəkə(ʊ)ˈθɪərɪən/ (also hyracotheriine /ˌhaɪərəkə(ʊ)ˈθɪərɪaɪn/) belonging to the genus Hyracotherium.
/ˌhaɪərəkə(ʊ)ˈθɪərɪən/ (also hyracotheriine /ˌhaɪərəkə(ʊ)ˈθɪərɪaɪn/) belonging to the genus Hyracotherium.ΘΚΠ
the world > animals > mammals > group Ungulata (hoofed) > order Perissodactyla (odd-toed ungulates) > [adjective] > relating to extinct or fossil types
palaeotheriodont1874
hyracotherian1887
rhinocerotid1916
1887 E. D. Cope in Amer. Naturalist Nov. 994 It has been from the Hyracotheriine sub-family that the horse line was derived.
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as lemmas