Dinnetherium is an extinct genus of morganucodont mammaliaform that is part of the monotypic order Dinnetheria. and is also part of the monotypic family Dinnetheriidae. The type species, D. nezorum, was named in 1983. It was discovered in a layer of the Kayenta Formation, within the Gold Spring Quarry 1, in Arizona. The holotype is MNA V3221, which is a partial right mandible.
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