Pristella maxillaris is the only species in the genus Pristella and is commonly known as the golden pristella tetra or X-ray tetra because of its highly transparent body.[1] It is a widely distributed and adaptable fish, being found in coastal rivers of Brazil, French Guiana, Guyana, and Venezuela in both acidic and alkaline waters. Tetra are species of small freshwater fish from Africa, Central America and South America belonging to the biological family Characidae and to its former subfamilies Alestiidae (the "African tetras") and Lebiasinidae. The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal fin and caudal fin. Many of these, such as the neon tetra (Paracheirodon innesi), are brightly colored and easy to keep in captivity. Consequently, they are extremely popular for home aquaria From Wikipedia, the free encyclopedia