The genera Ameghinoia Viana et Haedo Rossi and Polanskiella Rossi de Garcia are synonymized under Archimyrmex Cockerell, which now includes three species, A. rostratus (Middle Eocene, United States), A. piatnitzkyi (Upper Paleocene-Lower Oligocene, Argentina), and A. smekali (Upper Paleocene-Lower Oligocene, Argentina). These species are redescribed, and their assignment to the subfamily Myrmeciinae is argued.
