The endoral membrane extends across the peristomial field into the buccal cavity. It is usually named paroral membrane; however, due to its monostichomonad structure and probable homology to the endoral membrane of the stichotrichs, halteriids, oligotrichids, and most hypotrichs, this undulating membrane should likewise be called endoral membrane (Agatha 2004a, b). Agatha and Riedel-Lorjé (2006)