Margarya monodi is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.

[3] This species appears to be endemic to Lake Dianchi, in Yunnan Province, China.

This snail is no longer abundant as it was before the 1980s, when fishermen took as much as 20 kg a day per person.

Currently during the open fishing season the fishermen can find only 2 kg a day.

Threats to this snail species' survival include organic and inorganic pollution, overharvesting and some introduced species of predatory fish.