Pseudotribos belongs in the Shuotheriidae family of the Mammalia class which lived after the Middle Jurassic period.
Family: Shuotheriidae Pseudotribos ("false chewing") is an extinct genus of mammal that lived in Northern China during the Middle Jurassic some million years ago, possibly more closely related to monotremes than to theria (placental and marsupial mammals), although other studies indicate that these shuotheres are closer to therians than to monotremes. 
