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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Piter K Boll conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Ilana Rossi performed the experiments, analyzed the data, prepared figures and/or tables, reviewed drafts of the paper, histological processing and analysis of the morphology for the identification of the flatworms.

Silvana V Amaral analyzed the data, reviewed drafts of the paper, histological processing and analysis of the morphology for the identification of the flatworms.

Ana Leal-Zanchet analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper, analysis of the morphology for the identification of the flatworms.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

The work was conducted under the collection permits and licenses granted by Instituto Chico Mendes de Conservação da Biodiversidade (permit numbers 24357 and 26683).

Funding

The Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and the Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS) provided research grants and fellowships in support of this study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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