Shell of Rhiostoma samuiense A lectotype of R. chupingense NHMUK 1938.10.25.1 from Bukit Chuping, Perlis, Malay State B specimen CUMZ 3996 from Bukit Chuping, Perlis, Malaysia (topotype) C specimen CUMZ 3986 from Bang Saphan, Prachuap Khiri Khan D specimen CUMZ 4708 from Khanom, Nakhon Si Thammarat E specimen CUMZ 3990 from Tha Chana, Surat Thani F specimen CUMZ 3997 from Sungai Jernih, Perlis, Malaysia.

 
 
  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