Margarya oxytropoidesMargarya oxytropoides is a species of large operculate freshwater snail, an aquatic gastropod mollusc in the family Viviparidae, the river snails.DistributionThe distribution of Margarya francheti includes Dian Lake, Lugu Lake, and small lakes around Zhaotong in Yunnan Province, China.DescriptionZhang et al. provided details about the shell and about the radula.