Ageneiosus inermis, also known as Fidalgo, Dawala or Mandubé,[1] is a species of driftwood catfish of the family Auchenipteridae.

It can be found throughout South America, from Colombia and Venezuela to Uruguay and northern Argentina.

[3][4] The name Ageneiosus marmoratus has been recently synonymized with A. inermis.

The description was based on a strongly pigmented juvenile of A.

[4] The species feeds on a piscivorous diet, mainly hunting catfishes in the family Loricariidae and Doradidae.