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 Chaetomyinae Thomas, 1897 - thin-spined "porcupine" 1 Genus Chaetomys Gray, 1843 - thin-spined "porcupine"