Nannostomus limatus
Nannostomus limatus, (from the Greek: nanos = small, and the Latin stomus = relating to the mouth; from the Latin: limatus = elegant), commonly known as the elegant pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae. They were first described in 1978 by Stanley H. Weitzman along with two other new species (Nannostomus britskii and Nannostomus nitidus), from a collection of specimens preserved in the São Paulo museum.  Only rarely imported and kept by aquarists, they have been recorded from the Amazonian region of Brazil, specifically near Santarém.

References

Lebiasinidae
Taxa named by Stanley Howard Weitzman
Fish described in 1978
Fish of South America
Fish of the Amazon basin