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Additional Information

Competing Interests

Graciela Piñeiro is an Academic Editor for PeerJ.

Author Contributions

Graciela Piñeiro conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, revision of the collections and analysis of the specimens.

Pablo Núñez Demarco conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper, analyses and comparative measurements of the specimens.

Melitta D Meneghel conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper, comparative anatomical and morpho-funcional studies.

Data Deposition

The following information was supplied regarding data availability:

This manuscript did not generate raw data.

Funding

This study was funded by ANII-FCE 2011_6450 and NGS Grant 9497_14 (to GP). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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