Hi and thank you for your contribution to Wikipedia In this case in the chordate article I think you misunderstood the text a little The tetra is actually a bonefish What is unusual is that it has a largely transparent body whence we can see the backbone inside the living animal I do not think this is very common among bone fishes at least not in adult ones Am I wrong I can understand that this was possible to misunderstand since image was so dark that you hardly saw the backbone unless you enlarged it Therefore I changed the image to one which hopefully illustrates the idea better Thanks again for your edit if you hadn t done that I hadn t looked carefully at the image and hadn t changed it I hope you ll go on to edit the articles when you feel that you may improve them Best regards