''Tchangmargarya'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of large

operculate An operculum (; ) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also in a few groups of land snails, including the Helicinidae, Cyclophoridae, A ...

freshwater snail Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs t ...

aquatic Aquatic means relating to water; living in or near water or taking place in water; does not include groundwater, as "aquatic" implies an environment where plants and animals live. Aquatic(s) may also refer to: * Aquatic animal, either vertebrate ...

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

s in the family

Viviparidae Summary Viviparidae, commonly called river snails or mystery snails, are a family of freshwater snails with gills and a protective lid (operculum). Recent studies show that their family tree is messier than expected, with genetic evidence sugg ...

Taxonomy

''Tchangmargarya'' originally was a subgenus of '' Margarya'', and is elevated to a full genus based on molecular phylogeny and comparative morphology study.

Distribution

This genus appear to be endemic to

Yangzong Lake Yangzonghai Lake () (given on some maps as Yangzong Sea, though it is fresh water) is located between Yiliang County, Chenggong District and Chengjiang County, 45 kilometers east of Kunming City in Yunnan Province, China. About 30,000 people r ...

and lakes in

Stone Forest The Stone Forest or Shilin () is a notable set of limestone formations about 500 km2 in area located in Shilin Yi Autonomous County, Yunnan province of China. The forest is approximately east of the provincial capital Kunming. The tall r ...

Yunnan Province Yunnan; is an inland Provinces of China, province in Southwestern China. The province spans approximately and has a population of 47.2 million (as of 2020). The capital of the province is Kunming. The province borders the Chinese provinces ...

in the

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

Species

There are 3 extant species of ''Tchangmargarya'': * '' Tchangmargarya yangtsunghaiensis'' (Tchang & Tsi, 1949) -type species Di L., Jiang Y., Min W., Yeuing L., Aldridge D. & McIvor A. (2008)
''Margarya yangtsunghaiensis''
In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.3. . Downloaded on 14 September 2010.(possibly extinct) * '' Tchangmargarya multilabiata'' Zhang & Chen, 2015 * '' Tchangmargarya ziyi'' Zhang, 2017 (possibly extinct)

References

External links

* Viviparidae Gastropod genera {{Viviparidae-stub