Gymnotocinclus anosteos is a species of armored catfish (Loricariidae) endemic to Brazil, where it is found in the Tocantinzinho River in the Tocantins River basin.

[1] This species grows to a length of 4.4 centimetres (1.7 in) SL.

[2] The genus Gymnotocinclus is unusual among the Loricariidae due to its extremely reduced armor plates that are characteristic of the family, giving the fish a relatively naked body.

[1] This fish probably has a basal position in the subfamily Hypoptopomatinae.

This Loricariidae article is a stub.