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Potamolithus : ウィキペディア英語版 | Potamolithus
''Potamolithus'' is a genus of small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Tateidae.〔Davis G. M. & Pons da Silva M. C. (1984). "''Potamolithus'': morphology, convergence, and relationships among hydrobioid snails". ''Malacologia'' 25: (73 )-108.〕〔 〔 Bouchet, P. (2014). Potamolithus Pilsbry, 1896. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=724574 on 2014-07-29 〕 ''Potamolithus'' was traditionally classified within the Hydrobiidae.〔 However, anatomical study of ''Potamolithus'' by Davis & Pons da Silva (1984)〔 showed its relationship with ''Lithoglyphus'',〔 and it is then placed within the family Lithoglyphidae. The first appearance of the name ''Potamolithus'' was in November 1896 as a nomen nudum (a bare name with no description or illustration).〔Pilsbry H. A. & Rush W. H. (1896). "List, with notes, of land and fresh water shells collected by Dr. Wm. H. Rush in Uruguay and Argentina". ''The Nautilus'' 10(7): 76-81. (page 80 ).〕〔Lopez Armengol M. F. & Mancefiido M. O. (1992). "Case 2801. ''Potamolithus'' Pilsbry, 1896 (Mollusca, Gastropoda): proposed confirmation of ''P. rushii'' Pilsbry, 1896 as the type species". ''Bulletin of Zoological Nomenclature'' 49(2): (109 ).〕 The genus was formally defined by Pilsbry in December 1896.〔 == Distribution == ''Potamolithus'' is the only genus of the family Tateidae in South America. Distribution of ''Potamolithus'' includes Argentina (22 species, 11 species are endemic to Argentina),〔Rumi A., Gregoric D. E. G., Núñez V. & Darrigran G. A. (2008). "Malacología Latinoamericana. Moluscos de agua dulce de Argentina". ''Revista de Biología Tropical'' 56(1): 77-111. (HTM ).〕 Uruguay (17 species)〔 Scarabino F. (2004). "Lista sistemática de los Gastropoda dulciacuícolas vivientes de Uruguay". ''Comunicaciones de la Sociedad Malacológica del Uruguay'' 8(84–85/86–87): 347-355. (PDF ).〕 and Brazil.〔 ''Potamolithus'' is the largest genus (i.e. the one with the highest species richness) of recent freshwater snails in Argentina〔 and in Uruguay.〔
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