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By: Winter, Anton J. de - de Gier, WernerType: ArticleIn: ZooKeysVolume: 840Series:Issue:Date: 2019Page Range: 21-34Publication Info: Sofia, Bulgaria Pensoft PublishersSubjects: Afrotropical region Cameroon computerised tomography land snail Liberia Nigeria Ptychotrema shell morphology Stylommatophora taxonomy