Class [Mammalia] Linnaeus, 1758 - mammals Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Family Phalangeridae Thomas, 1888 - possums and cuscuses Genus Trichosurus Lesson, 1828 - brush-tailed possums Trichosurus arnhemensis Collett, 1897 - northern brushtail possum