TchangmargaryaTchangmargarya is a genus of large operculate freshwater snails, aquatic gastropod molluscs in the family Viviparidae.TaxonomyTchangmargarya originally was a subgenus of Margarya, and is elevated to a full genus based on molecular phylogeny and comparative morphology study.DistributionThis genus appear to be endemic to Yangzong Lake and lakes in Stone Forest in Yunnan Province in the China.SpeciesThere are 3 extant species of Tchangmargarya:Tchangmargarya yangtsunghaiensis -type species Tchangmargarya multilabiata Zhang & Chen, 2015 Tchangmargarya ziyi Zhang, 2017