Rhinodoras armbrusteri is a species of thorny catfish known from the Takutu River and Ireng Rivers that drains into the upper Rio Branco in Guyana and Roraima State, Brazil; it is also known from the Rupununi River in the Essequibo River basin in southwestern Guyana.

This species grows to a length of 9.62 centimetres (3.79 in) SL.

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