Italiano: This specimen, USNM 22456, was initially identified by Gazin (1962) as a hyaenodontid creodont: "Sinopa, possibly S. viverrina." Subsequently, Van Valen returned S. viverrina to the genus Prototomus (Van Valen, 1965), and then asked the International Commission on Zoological Nomenclature to designate USNM 22456 as the neotype of Prototomus viverrinus Cope, 1874. Knowledge gained from additional collecting and research on Eocene carnivorous mammals indicates that USNM 22456 represents a species Wyolestes dioctes (a carnivorous mammal) rather than a representative of "creodont" genus Prototomus.
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