Trichomycterus alternatus

{{Short description|Species of fish}}

{{Speciesbox

| taxon = Trichomycterus alternatus

| authority = (Eigenmann, 1917)

| synonyms = *Pygidium alternatum Eigenmann, 1917

• Trichomycterus alternatum (Eigenmann, 1917)
• Pygidium florense Miranda Ribeiro, 1943
• Trichomycterus florense (Miranda Ribeiro, 1943)
• Trichomycterus florensis (Miranda Ribeiro, 1943)
• Pygidium travassosi Miranda Ribeiro, 1949
• Trichomycterus travassosi (Miranda Ribeiro, 1949)

}}

Trichomycterus alternatus is a species of pencil catfish endemic to Brazil, where it occurs in coastal river basins in Rio de Janeiro and Espírito Santo. This species reaches a maximum length of {{convert|8.1|cm|in}}.{{FishBase |genus= Trichomycterus|species=alternatus| month = July | year = 2014}}