Gambierdiscus australes. (A-D) Scanning electron micrographs of precingular plates 1? to 7″ with apical pore plate (Po) (black arrow). (C) Broadly shaped fish hook apical plate (Po) with apical pores (black arrow). (D) Postcingular plates (1˝? to 5˝?) and intercalary plate (1p) in antapical view.