A new genus and species of eutherian mammal has been described from a handful of tiny teeth found in the Prince Creek Formation in northern Alaska, the United States. The species represents the northernmost occurrence of a Mesozoic eutherian (paleolatitude 80-85 °N). Reconstruction of the Prince Creek Formation fauna. Image credit: Andrey Atuchin. The newly-described species, Sikuomys mikros, lived in what is now Alaska during the Late Cretaceous...