Phenacodus is an extinct genus of mammals from the late Paleocene through middle Eocene, about 55 million years ago. It is one of the earliest and most primitive of the ungulate mammals, typifying the family Phenacodontidae and the order Condylarthra. The typical Phenacodus primaevus was a relatively small ungulate about 1.5 m (5 ft) long and weig...
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http://en.wikipedia.org/wiki/Phenacodus
extinct genus of primitive mammals known from fossils of the Early Eocene Epoch (57.8 to 52 million years ago). Though too late in time to have been ... [1 related articles]
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http://www.britannica.com/eb/a-z/p/55
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