Trichomycterus argos is a species of pencil catfish endemic to Brazil, where it occurs in the Doce River Basin, situated in the Serra do Brigadeiro range, Minas Gerais.[1] This species reaches a maximum length of 11.7cm (04.6inches) SL.
T. argos occurs in streams with depths varying between 13and and water temperatures varying between 14C19C. Under laboratory conditions, it has been observed preying on tadpoles of the Scinax catharinae species group.