Class Mammalia Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899 Family Octodontidae Waterhouse, 1840 - octodonts Genus Aconaemys Ameghino, 1891 - rock rats see Genus Pithanotomys Ameghino, 1887 Aconaemys sagei Pearson, 1984 see Pithanotomys sagei