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  1. By: Cabrera, Mario R. - Colantonio, Sonia E.
    Type: Article
    In: Iheringia. Série Zoologia
    Date: 2001-11-01
    Subjects: Chelidae  pattern variation  Phrynops  Reptilia  South America
  2. By: Bujes, Clóvis Souza
    Type: Article
    In: Iheringia. Série Zoologia
    Date: 2010-12-01
    Subjects: Acanthochelys  Hydromedusa  Phrynops  quelônios  Trachemys