Nannostomus bifasciatus, (from the Greek: nanos = small, and the Latin stomus = relating to the mouth; from the Latin: bifasciatus = two bands),[1] is a freshwater species of fish belonging to the characin family Lebiasinidae. It is commonly known as the two-lined pencilfish.[2] It can be found in slow-moving swamps and rivers in French Guiana and Suriname.