It is one of the earliest and most primitive of the ungulate mammals, typifying the family Phenacodontidae and the order Perissodactyla.
2.
"' Phenacodontidae "'is an extinct family of large herbivorous mammals traditionally placed in the wastebasket taxon Condylarthra, that may represent early epochs ( about 60-50 million years ago ) and their fossil remains have been found in North America and Europe.
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