User blog comment:Aandrew07/Discussion of the Week: Subspecies/@comment-5020152-20121027182740/@comment-4212769-20121027183703

HC Pink Rathain and HC Azure Rathalos were introduced together. If this was relevant to Berukyurosu and Doragyurosu then it would be HC Azure Rathalos/Pink Rathian and HC Rathalos/Rathian together.

And it's just too similar to Berukyurosu to not be a subspecies. They almost share all traits in look but have different colors. I believe it's a proven thing that Doragyurosu is a subspecies of Berukyurosu.