Rhiostoma is a genus of operculate land snails in the subfamily Cyclophorinae of the family Cyclophoridae, native to parts of Asia.

The last whorl is separate from the rest of the shell and features a tube-like snorkel structure.

[3] In anatomy, a promontory is another word for a protuberance, so Rhiostoma can be understood to mean "protruding hole."

Somwang Pathamakanthin of Thailand said about the ecology of Rhiostoma, "As we have kept some living animals of Rhiostoma species in our garden, we know that most of them burrow into the ground during the day and are active only when it is raining or-sometimes-during the night, when the temperature is lower and the humidity is higher.

We have been informed that the bluish Rhiostoma from Songkhla province prefers to burrow into the soil underneath fallen wood or under stones close to the foot of limestone hills.