A new lagomorph, Dawsonolagus antiquus, gen. et sp. nov., collected from the possible late early Eocene Arshanto Formation of Nei Mongol (Inner Mongolia), China, is described. The material includes a partial skull with P4-M2 on both sides, two fragmentary mandibles, several isolated teeth, three calcanei and an astragulus. The new genus is characterized by a mosaic combination of features similar to mimotonids and lagomorphs, presenting a morphotype intermediate between a mimotonid and a typical lagomorph.
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Li et al. (2007) studied this question.
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