Trichomycterus astromycterus is a species of freshwater ray-finned fish belonging to the family Trichomycteridae, the pencil and parasitic catfishes. This catfish is found in Brazil.

Description The fish is distinguished based on the quantity and description of a number of features. It has thirty-three vertebrae. It was noted that it shared characteristics with the genus Bullockia, but required further study to determine how much.

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