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By: Duncan, Wallice Luiz Paxiúba - Silva, Maria Isabel da - Fernandes, Marisa NarcisoType: ArticleIn: Sociedade Brasileira de IctiologiaVolume:Series:Issue:Date: 2015-03-01Page Range:Publication Info: Sociedade Brasileira de IctiologiaSubjects: Foetus Gill morphology hypoxia tolerance potamotrygonid respiratory area