Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Echimyidae Gray, 1825 - spiny rats Subfamily Echimyinae Gray, 1825 Genus Echimys Cuvier, 1809 - arboreal spiny rats Echimys thomasi (Ihering, 1871) see Phyllomys thomasi (Ihering, 1897)