Shell of Rhiostoma breviocollar sp. nov. A holotype CUMZ 4490 from Khao Samorkon, Ban Mi, Lopburi B–D paratypes CUMZ 4491 from type locality E, F specimens from Khao Patavi, Tubtan, Uthai Thani E specimen CUMZ 4492 and F specimens CUMZ 4493.

 
 
  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