What physical trait is responsible for the common name 'X-Ray Tetra'?
Answer
Its translucent body which allows internal structures to be clearly seen
The common name reflects its most distinctive feature: a translucent body where internal structures are visible, similar to an X-ray image.

Related Questions
What is the scientific name for the X-Ray Tetra?To which family does the X-Ray Tetra belong according to its scientific classification?Which continent represents the native geography for the X-Ray Tetra?Besides the Amazon River basin, which two other major drainage areas are principally associated with this species?What specific habitat feature do X-Ray Tetras generally prefer over massive river channels?What physical trait is responsible for the common name 'X-Ray Tetra'?What characteristic of the water chemistry is often found in the natural areas these tetras inhabit?What feature distinguishes the X-Ray Tetra from many other tetras sharing its habitat regarding pigmentation?What small splash of color is typically observed on the otherwise translucent X-Ray Tetra?What common occurrence today is responsible for the global presence of the X-Ray Tetra outside of South America?