Name Rhynchippus time Early Oligocene locality South America

(Argentina) size: 3 ft 4 in/1 m long Rhynchippus ("snout horse") presents a classic example of the convergence of South American ungulates with unrelated groups elsewhere in the world; in this case, with the horse. Its skeleton, with its deep body and its clawed toes, was not particularly horselike, but the teeth were similar to those of a grazing animal such as a horse or a rhinoceros.

The canine teeth did not form tusks, as they did in most other toxodonts, but were the same size and shape as the incisors. These were tall and ideal for cropping. The large cheek teeth had convoluted enamel for grinding tough vegetation, and were coated in a cement.

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