Class [Mammalia] Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Family Heteromyidae Gray, 1868 - pocket mice, kangaroo rats, and kangaroo mice Genus Perognathus Wied-Neuwied, 1839 - silky pocket mice Perognathus artus - narrow-skulled pocket mouse see Chaetodipus artus Osgood, 1900