Hypoptopoma psilogaster is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypoptopomatinae. the cascudinhos. This catfish is found in the Juruá, Japurá-Caquetá, Napo and Amazon in Brazil and Peru. This species reaches a standard length of .
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