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Margarya
''Margarya'' is a genus of large operculate freshwater snails, aquatic gastropod mollusks in the family Viviparidae. 〔 Bouchet, P. (2014). Margarya G. Nevill, 1877. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=758767 on 2014-12-10 〕〔 ==Taxonomy== The genus ''Margarya'' was described by Nevill (1877) based on shells of the type species collected by A.R. Margary from Lake Erhai, the type locality of ''Margarya melanioides''.〔 Based on shell and radular morphology, Tchang & Tsi (1949) revised this genus for the first time and recognized seven distinct species.〔 Tchang, X. & Tsi, Z. Y. (1949). "A revision of the genus ''Margarya'' of the family Viviparidae". ''Contributions from the Institute of Zoology, National Academy of Peiping'' 5: 1-26. 〕 He J. erected two subgenus of ''Margarya'' , viz ''Tchangmargarya'' and ''Mabillemargarya''.〔 He J. (2013). "A conchological review of ''Margarya''-complex (Gastropoda: Viviparidae)". ''Shell Discoveries'' 2: 2-15. 〕 The first molecular phylogeny showed that the genus ''Margarya'' is polyphyletic and divided into three distinct clades.〔Du L., Yang J., von Rintelen T., Chen X. & Aldridge D. (2013). "Molecular phylogenetic evidence that the Chinese viviparid genus ''Margarya'' (Gastropoda: Viviparidae) is polyphyletic". ''Chinese Science Bulletin'' 58(18): 2154-2162. 〕 Combining study of comparative morphology and molecular phylogeny, Zhang ''et al''. revised the systematics of ''Margarya'' and recognized eight genuine extant species. However, only four species were found belonging to ''Margarya'' s. str., the rest species belonging to distinct genus ''Tchangmargarya'' or ''Anularya''.〔
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