Tenellus is a genus of thorny catfishes native to tropical South America.
Species There are currently 4 recognized species in this genus: Tenellus cristinae (Sabaj Pérez, Arce H., Sousa & Birindelli, 2014) Tenellus leporhinus (C. H. Eigenmann, 1912) Tenellus ternetzi (C. H. Eigenmann, 1925) Tenellus trimaculatus (Boulenger, 1898)
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