Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Infraclass Eutheria Gill, 1872 Magnorder Boreoeutheria Springer & de Jong, 2001 Superorder Euarchontoglires Murphy, Stanyon & O'Brien, 2001 Order Scandentia Wagner, 1855 - tree shrews Family Ptilocercidae Lyon, 1913