Class [Mammalia] Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Family Echimyidae Gray, 1825 - spiny rats Genus Echimys Cuvier, 1809 - arboreal spiny rats Echimys semivillosus (I. Geoffroy, 1838) see Pattonomys semivillosus (I. Geoffroy, 1838)