Dunbar and Skinner, 1931 Pseudofusulinidae Lower Permian American South unknown Loeblich and Tappan identified by scientist 1 / FEU-1014642 | (Schellwien) Em. Igo, 195 Pseudofusulinidae Pennsylvanian unknown Loeblich and Tappan identified by scientist 2 / FEU-1014643 |