The only member of the Pristella genus, the X-Ray Tetra is also sometimes called the Golden Pristella Tetra. These fish are named for their transparent bodies. Many specimens exhibit a slight reddish hue on the caudal fin as well as yellow, black and white banding on the dorsal and anal fins. X-Ray Tetras are most often found in the coastal waters of Guyana, Suriname, Venezuela and northern Brazil. These fish tend to inhabit clear streams and tributaries, though during the rainy season they may migrate to the savannah where they spawn among areas of submerged vegetation.