What question did this study set out to answer?

The aim is to describe a new species of Phenacorhamdia from the upper Bermejo River basin in Argentina.

Hidden diversity in the Paraná River basin: a new species of Phenacorhamdia (Siluriformes: Heptapteridae) from the Bermejo River, Argentina

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Research identifies a new species of fish in the Bermejo River, highlighting hidden biodiversity in Argentina.

The aim is to describe a new species of Phenacorhamdia from the upper Bermejo River basin in Argentina.
Examination of specimens from the upper Bermejo River basin and Paraná River basin.
Morphological analysis and genetic analysis using COI gene for distinction from known species.
A new Phenacorhamdia species is distinguished based on morphological features and genetic distance from P. tenebrosa.
The new species has 41-42 vertebrae and iii-iv, 7-9 anal-fin rays.

Aguilera et al. (2026) studied this question.

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