Class [Mammalia] Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Family Heteromyidae Gray, 1868 - pocket mice, kangaroo rats, and kangaroo mice Genus Microdipodops Merriam, 1891 - kangaroo-mice Microdipodops megacephalus Merriam, 1891 - dark kangaroo-mouse