Copecion was a genus of early herbivorous mammals that was part of the family Phenacodontidae.P. D. Gingerich. 1989. "New earliest Wasatchian mammalian fauna from the Eocene of northwestern Wyoming: composition and diversity in a rarely sampled high-floodplain assemblage". University of Michigan Papers on Paleontology 28:1-97. It reached 6 to 12 kg and was similar in size and morphology to Ectocion. Both these herbivorous ungulates likely occupied similar ecological niches.
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