Neubert, E. (2005). The continental malacofauna of Arabia and adjacent areas, IV. Revision of the family Cerastidae in the Soqotran Archipelago, I: The genus
Passamaella L. Pfeiffer 1877, with description of a new genus and species. (Gastropoda: Pulmonata: Cerastidae).
Archiv für Molluskenkunde. 134(1): 1-21.