Holotype population of Olifantiella gondwanensis sp. nov. from Fitzroy Island A–P valves in size diminution series viewed by light microscopy Q–X SEM micrographs Q, R external view of the valve, white arrowhead indicates the girdle band S opened frustule T details of valve central part in external view U detail of valve apex in internal view V internal view of valve W details of valve central part in internal view X detail of valve apex in internal view. = indicates a valves of the same specimen. Scale bars: 10 µm (A–P); 5 µm (Q, R); 4 µm (S); 3 µm (V); 1 µm (T, U, W, X).