Shell of Rhiostoma platymorpha sp. nov. A holotype CUMZ 4498/1 from Tham Muang On, Mae On, Chiang Mai B paratype CUMZ 4763 from type locality C, D paratypes CUMZ 4498/2 from type locality E, F specimens CUMZ 4783 from Tham Bua Tong, Mae Tang, Chiang Mai (with F albinistic shell form).

 
 
  Part of: Tongkerd P, Tumpeesuwan S, Inkhavilay K, Prasankok P, Jeratthitikul E, Panha S, Sutcharit C (2023) Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species. ZooKeys 1142: 1-144. https://doi.org/10.3897/zookeys.1142.90097