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By: Thiengo, Silvana - Vicente, Joaquim Júlio - Pinto, Roberto MagalhãesType: ArticleIn: Revista Brasileira de ZoologiaVolume:Series:Issue:Date: 1997-12-01Page Range:Publication Info:Subjects: Angiostrongylus (P.) costaricensis Brazil Mollusca Morphology Nematoda Sarasinula margínala taxonomy