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Pomacea diffusa : ウィキペディア英語版 | Pomacea diffusa
''Pomacea diffusa'', common name the spike-topped apple snail, is a species of freshwater snail, an aquatic gastropod mollusk in the family Ampullariidae, the apple snails. == Taxonomy == ''Pomacea diffusa'' was originally described as a subspecies of ''Pomacea bridgesii''.〔 Pain (1960)〔Pain T. (1960). "''Pomacea'' (Ampullariidae) of the Amazon River system". ''Journal of Conchology'' 24: 421-432.〕 argued that ''Pomacea bridgesii bridgesii'' was a larger form with a restricted range, with the smaller ''Pomacea bridgesii diffusa'' being the common form throughout the Amazon Basin (Brazil, Peru, Bolivia).〔 Cowie and Thiengo (2003)〔Cowie R. H & Thiengo S. C. (2003). "The apple snails of the Americas (Mollusca: Gastropoda: Ampullariidae: ''Asolene'', ''Felipponea'', ''Marisa'', ''Pomacea'', ''Pomella''): a nomenclatural and type catalog". ''Malacologia'' 45: 41-100.〕 suggested that the latter might deserve full species status, and the two taxa have been confirmed as distinct species by genetic analyses.〔
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