Alamitophis argentinus was named by Albino (1986). Its type specimen is MACN-RN 27, a set of vertebrae (median trunk vertebra), and it is a 3D body fossil. Its type locality is Los Alamitos vertebrates, middle section, which is in a Campanian/Maastrichtian lacustrine - large siltstone/sandstone in the Los Alamitos Formation of Argentina.