User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-25192100-20140908182425/@comment-4009941-20140910145836

There is currently 28 variations of true Rath's as I would call them(Actual Rathalos and Rathian). 3 related species Unknown, Zeru, and Canopus(Extinct). 1 possible related is Seruregiosu  whos decription almost completely matchs that of Canopus.