What is X-ray tetra?
[[Image:Pristella maxillaris.jpg|thumb|right|230px|X-ray tetra]] The '''X-ray tetra''', also known as the '''X-ray fish''', is a species of fish. It is titled in such a manner because it looks like an [[X-ray]]. However, instead of X-ray tetra, it is also called the '''X-ray fish''' in some [[Clip art|clip arts]]. It is world renowned as one of the only [[Chordata|chordates]] with a visible spine. [[Category:Characiformes]] {{biology-stub}}