''Characidium sterbai'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of South American darter (family Crenuchidae)

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

where it is found in the upper Amazon River basin.Melo, M.R.S., Buckup, P.A. & Oyakawa, O.T. (2016)
A new species of ''Characidium'' Reinhardt, 1867 (Characiformes: Crenuchidae) endemic to the Atlantic Forest in Paraná State, southern Brazil.
''Neotropical Ichthyology, 14 (3): e160014.''

References

Crenuchidae Fish of South America Fish of Peru Taxa named by Axel Zarske Fish described in 1997 {{Characiformes-stub