::Maybe it should be in the article about the Indo-Pacific, or maybe it should be mentioned in the biogeography article. Whatever the case, it doesn't belong in an article about a single species when it's a fact that applies to thousands. But tell you what, find me a reference that talks about why the whitetip reef shark specifically is absent from the Atlantic Ocean, and I'll put it in. Since you insist that this is important enough for inclusion in this particular article, my request should pose no difficulty.